These flowers are not real; they are (a)   ones made from silk. (nhân tạo)

The new smartphone is so (a)   that even adults find it hard to use. (phức tạp)

The population may (a)   if more people move abroad. (giảm)

A (a)   camera uses electronic signals instead of film. (kỹ thuật số)

Columbus is said to (a)   America in 1492. (khám phá)

The new policy had a big (a)   on the company’s sales. (tác động)

The lab is full of high-tech (a)   for scientific experiments. (thiết bị)

Can you (a)   how much this project will cost? (ước lượng)

Please give me the (a)   number of students in the class. (chính xác)

The students conducted an (a)   to test the new chemical. (thí nghiệm)

This small (a)   can translate languages instantly. (thiết bị nhỏ tiện ích)

My computer’s (a)   needs to be upgraded to run faster. (phần cứng)

Edison (a)   the electric light bulb in 1879. (phát minh)

The project will (a)   working with other departments. (liên quan đến)

We do experiments in the school (a)   . (phòng thí nghiệm)

The report shows a serious (a)   of skilled workers. (sự thiếu)

I always carry my (a)   to work because it’s light and easy to use. (máy tính xách tay)

The (a)   speed on this road is 60 kilometers per hour. (tối đa)

The temperature fell to its (a)   level last night. (tối thiểu)

Do you know how to (a)   this new washing machine? (vận hành)

Most toys are made of (a)   because it’s cheap and durable. (nhựa)

You can (a)   your robot to clean the house at 8 a.m. every day. (lập trình)

The scientists are doing (a)   on renewable energy. (nghiên cứu)

Please don’t forget to (a)   the computer before you leave. (chạy, vận hành)

The phone’s (a)   is too small to watch a movie comfortably. (màn hình)

To install this app, you need to update your (a)   first. (phần mềm)

His decision to quit was so (a)   that everyone was shocked. (đột ngột)

Modern (a)   makes our lives much easier. (công nghệ)

Each snowflake is (a)   —no two are exactly the same. (độc nhất)

My car suddenly (a)   on the way to work. (hư, ngừng hoạt động)

I (a)   an old photo of my grandparents while cleaning the attic. (tình cờ tìm thấy)

We need to (a)   who sent this mysterious letter. (tìm ra, phát hiện ra)

She didn’t know the answer, so she just (a)   a story. (bịa ra)

I can’t believe he (a)   such a difficult project by himself! (làm được điều khó)

Don’t (a)   those bottles — they can be recycled. (vứt đi)

Please (a)   the TV before you go to bed. (tắt)

Can you (a)   the air conditioner? It’s too hot in here. (bật)

After years of waiting, they got married (a)   . (cuối cùng)

I met my best friend purely (a)   at a coffee shop. (tình cờ)

(a)   , technology has both advantages and disadvantages. (theo ý kiến của tôi)

We were tired, but (a)   we finished the project successfully. (cuối cùng)

What kind of job would you like to have (a)   ? (trong tương lai)

The vending machine is (a)   ; please use another one. (hư, trục trặc)

Water will (a)   100°C. (sôi)

The factory uses a (a)   to heat water for the machines. (nồi hơi)

The (a)   experiments were done carefully in the lab. (hóa học)

She’s studying (a)   at university because she loves experiments. (môn hóa học)

After careful thought, the judge reached the (a)   . (kết luận)

The teacher will (a)   your papers this afternoon. (kiểm tra)

Students must pass an (a)   at the end of the course. (bài kiểm tra)

The (a)   will decide how well you performed. (giám khảo)

Space has always been a source of great (a)   for scientists. (sự say mê)

The book is so (a)   that I couldn’t put it down. (hấp dẫn)

The castle is of great (a)   importance to the nation. (mang tính lịch sử)

A (a)   studies and writes about past events. (nhà sử học)

The twins are almost (a)   in appearance. (giống hệt nhau)

The rooms were decorated (a)   to make them look the same. (giống hệt nhau)

The table is two meters in (a)   . (chiều dài)

We need to (a)   the height of the tower accurately. (đo lường)

Scientists use (a)   to make sure their results are precise. (sự đo lường)

Einstein is one of the most famous (a)   in the world. (nhà khoa học)

This dress is completely (a)   the one I saw yesterday. (khác với)

The sky is (a)   stars tonight. (đầy...)

Let’s (a)   the lesson with a short review. (bắt đầu bằng...)

You can ______ your phone ______ the printer to print documents. (kết nối với)

(a)  

Please ______ the charger ______ the power source before cleaning it. (ngắt kết nối khỏi)

(a)  

Can you ______ the glass ______ water, please? (làm đầy bằng...)

(a)  

Poor diet can (a)   serious health problems. (dẫn đến)

There’s a big (a)   the two computer models. (sự khác biệt giữa)

She has an interesting (a)   how AI will change education. (ý tưởng về)

A (a)   students are taking part in the science fair. (một số lượng...)

What’s the (a)   your absence yesterday? (lý do cho)

This is a new (a)   phone never seen before. (một loại...)