Although it is_____ to wear a helmet for a long time, it can protect your head.

Mrs Yang often makes_____ cakes and biscuits for kids and kids like them very much.

 —What_____ of high school students go to college? —About 70%.

— What’s the most popular form of_____ in this city?

— It’s hard to say. Maybe going to the movies is.

—Shall we camp by the river for the night?

— OK. Let’s take out our tent and_____.

— Is your father ______ the date of the parents’ meeting? — I am afraid not. He is sometimes forgetful.

 — What do you think of working in that company?

—_____, of course. I have to face so much competition.

The plan sounds good. But we still have some difficulty in_____.

Our Earth is_____ one of_____ planets in the solar system.

— Do you know how many people were on the missing flight MH370?

— 239. And nearly_____ of them are Chinese.

The conditions and climate on Mars are very different from_____ on the Earth. It is difficult for people to get used to them.

The more you practise using the language, the_____ you will make progress in learning it.

Mars as well as its two moons _____ around the Sun once every 687 days.

— Would you like to take part in the cross-country race?

— I’m not sure if I can finish the long running race._____.

The dog is _____ to open the door by itself.