Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

I wish everything _____________  so expensive.

A. would be

B. wouldn’t be

C. won’t be

D. could be

Trong hệ thống nước máy thành phố, người ta thường cho một lượng nhỏ khí nào để sát khuẩn?

A. Cl₂.

B. O₂.

C. CO₂.

D. N₂.

Cho 3,6 gam Mg tác dụng hết với dung dịch HNO₃ (dư), sinh ra V lít khí NO (ở đktc, sản phẩm khử duy nhất). Giá trị của V là

A. 3,36.

B. 1,12.

C. 4,48.

D. 2,24.

Ở điều kiện phòng thí nghiệm, đơn chất nào có cấu tạo mạnh tinh thể phân tử

A. Iot

B. Brom

C. Clo

D. Flo

* Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.

 Now our parents are still alive. We should be grateful to them and thank them for what they have done for us.

A. Now our parents are still alive to be grateful to and to be thanked for what they have done for us. 

B. If our parents are not alive, we will not need to be grateful to them and thank them for what they have done for us. 

C. We should be grateful to our parents when they are still alive and thank them for what they have done for us. 

D. Our parents will live longer if we are grateful to them and thank them for what they have done for us.

Cho 5,6 gam sắt tác dụng với dung dịch H₂SO₄ 4M ở nhiệt độ thường. Tốc độ phản ứng tăng khi

A. giảm thể tích dung dịch H₂SO₄ 4M xuống một nửa

B. dùng dung dịch H₂SO₄ 6M thay cho dung dịch H₂SO₄ 4M

C. tăng thể tích dung dịch H₂SO₄ 4M lên gấp đôi

D. dùng dung dịch H₂SO₄ 2M thay cho dung dịch H₂SO₄ 4M

Khi bắt đầu phản ứng, nồng độ một chất là 0,024 mol/l. Sau 10 giây xảy ra phản ứng, nồng độ của chất đó là 0,022 mol/l. Tốc độ trung bình của phản ứng trong trường hợp này là

A. 0,00015 mol/l.s.

B. 0,0003 mol/l.s.

C. 0,0002 mol/l.s.

D. 0,0004 mol/l.s.

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 23 to 27. Fill in the appropriate word in question 25

  Many people enjoy lying in bed in the morning, but can you imagine having to spend 90 days in bed? Could you stand the boredom and the frustration of not being (23) _____________ to get up? That was the task that faced 14 volunteers when they started out on a bed-rest experiment being conducted (24)_____________  the European Space Agency.

  The study had a serious purpose: to investigate the changes that take place in the human body during long-duration spaceflight. Lying in a horizontal position was the best way of (25)_____________  weightlessness. The aim was to discover what effect period of weightlessness will have on the health of astronauts spending several months on the International Space Station.

  The volunteers ate their meals, took showers and underwent medical tests without ever sitting up. That’s even tougher than it sounds, especially when you (26)_____________ that no visitors were permitted. However, each volunteer did have a mobile phone, as well as access to the latest films, computer games and music. Surprisingly, Everyone was in a good (27)_____________  at the end of the 90 days, “I would do it again,” said one of the volunteers. “It was disorientating, but we knew we were ‘contributing to medical research and space exploration.”

A. simulated

B. simulate

C. to simulate

D. simulating