It is important that (a)   pay more attention to the problem of global warming. (LAW)

Global warming may have negative impacts on the     (a)   balance on Earth. (ECOLOGY)

It seems to me that global warming is not the reason of any (a)   disease at all. (INFECT)

 CO2 (a)   are the main cause of global warming which is dangerous to all on Earth. (EMIT)

Global warming, which may wipe out Earth’s plants and animals, will affect the (a)   on Earth. (DIVERSE)

Global warming may lead to (a)   weather events, including heat waves, floods, and powerful storms, which could affect people's lives. (EXTREMELY)

Every one of us can help to protect and sustain our environment by (a)   our consumption habits. (CHANGE)

Even slight increase in the levels of carbon dioxide in the atmosphere can cause a (a)   rise in temperature. (SIGNIFICANCE)

There is a (a)   between the recent droughts and climate change. (CONNECT)

Farming contributes more than 30 percent of the total greenhouse gas (a)   . (EMIT)

The overuse of chemical (a)   is a serious threat to the environment. (FERTILIZE)

Global warming is the increase in the earth's average surface temperature due to the warming (a)   of greenhouse gases. (EFFECTIVE)

The main cause of (a)   warming is the burning of fossil fuels, such as natural gas, oil, and coal. (GLOBE)

The (a)   of the earth's atmosphere causes sea-level rise. (WARM)

Many animal species are in danger of extinction due to the loss of their habitat and inability to (a)   to climate change. (ADAPTION)

The lawmakers admitted not (a)   the most important cause of high carbon footprint.(OVERLOOK)

A (a)   degree is the highest university degree. (DOCTOR)

If you want to pursue higher education abroad, you should improve your English and (a)   your knowledge about culture. (BROAD)

The higher education (a)   gained at UK universities and colleges are recognised worldwide. (QUALIFY)

One of the reasons for Vietnamese students' studying abroad is the quality of the (a)   programmes in higher education. (ACADEMY)

He served the army after (a)   .  (GRADUATE)

Cuc Phuong National Park is also a(n) (a)   zone of fauna. (ABUNDANCE)

A number of caves in Huong Son Complex are (a)   sites belonging to the Hoa Binh Culture dated back to over 10,000 years. (ARCHAEOLOGY)

Set in a quiet environment, Hoi An is (a)   by peaceful villages that have crafts such as carpentry, bronze making, and ceramic. (SURROUNDING)

Phong Nha - Ke Bang National Park is one of the finest and most (a)   examples of a complex limestone landform in Southeast Asia. (DISTINCT)

I’d like to consult you about the (a)   differences (that) I should be aware of. (CULTURE)

What (a)   me most is the high cost of living in London as an international student. (WORRY)

Universities must better prepare students for their (a)   careers. (PROFESSION)

. I got a diploma in business administration, but still sometimes I wish I had been able to go university and get a (a)   (SCHOLAR)

Nam won a scholarship. We are excited about that fact.

→ We are

The volunteers couldn't mow the old lady's lawns because of the rain.

→ The rain prevented

Tonya had dumped a lot of rubbish on the beach. She was strongly criticized for that.

→ Tonya was

Since we have become too dependent on the use of electricity, we have to find alternative sources of energy before fossil fuels run out.

→ Having

In the Tree Planting Competition, the students in Group 11G planted the most trees in the schoolyard. They were praised for that.

→ The students in

After she had replaced all the light bulbs in her house with LED lights, she saved a lot of money on her electricity bills

→ Having

Sam had not worked hard enough in his previous job. He regretted it.

→ Sam regretted

Someone had cut down the oldest tree in the park. The police suspected Mike of doing it.

→ The police suspected

. Since the farmers have used too much chemical fertilizer on their farm, they now have to drink polluted water.

→ Having

Denis had taken an active part in the Green Summer activities. He was rewarded for that.

→ Denis was

Zoe had practiced a lot, so she was sure of her winning in the competition.

The boy asked his mother's permission and then went out to play.

As he had drunk too much, he didn't drive home himself.

We have done two tests today, so we are exhausted.

She filled the washing machine and switched it on.

She had been to disco the night before and she overslept in the morning.

We had worked in the garden all day and were sunburned in the evening.

She had not slept for two days and therefore she wasn't able to concentrate.

Since I had not seen him for ages, I didn’t recognize him.

I had not ridden a horse for a long time and I found it very difficult to sit on the saddle.

I started discussing my research proposal with my professor at the beginning of my course. We're still discussing it.

Nam's still studying English. He started studying it two years ago. (for)

I started learning how to play the piano eight months ago. I'm still learning it.

. He attended two online vocational courses: one in 2012 and the other in 2013. (twice)

They visited this college in 2009, 2012 and 2014. (three times)

The British Council established IELTS a long time ago. It still uses this test as an international standardized test of English for non- native English language speakers. (for)

She started her research project last month. She's still doing it

The university started building a new campus in May. They are still building it. (since)

The graduate students started arriving at four o'clock. They are all in the lecture hall.

Mary is staying at a homestay during her undergraduate programme. The programme began three weeks ago. (for)

Maxicorp were the only company which replied my letter.

Do you know the man who is talking to my father?

Applications which were sent after 23^rd will not be considered.

We have a lot of exercises which we have to do tonight.

Studies of her son are the most important thing that she cares about.

The equipment which belongs to the club is insured.

George is the first person that we will interview.

Meetings which are held every month are called monthly meetings.

The most excellent students who were rewarded the scholarship would have a two-week holiday in Vung Tau.

The trees which were planted last week are growing well.