1. Choose the correct option.

(Chọn phương án đúng.)

1. If the rocket launches / launched at the right time, it will reach the moon in six weeks.

2. You won't see the comet unless / if you have a good telescope.

3. I always watch Star Watch if it's / it will be on TV.

4. I wouldn't go into space if you pay / paid me!

5. Would you study astronomy if you have / had the chance?

6. If the weather isn't good, you won't see / will see the planet clearly.

2. Order the words in brackets to complete the sentences.

(Sắp xếp các từ trong ngoặc để hoàn thành câu.)

1. If you want to be an astronomer, _______________ (physics / need / study / to / you).

2. I'd come to the party _______________ (an exam/if/tomorrow/ have /1/ didn't).

3. _______________ (out/Kate/go/won't / unless) the weather improves.

4. _______________ (with us / if / want / you / to / come), I'll give you a lift.

5. If students fail the exam, _______________ (again/can/it/ take / they).

6. If you could go anywhere in the world, _______________ (go/ you / where / would)?

3. Complete the interview with an astronaut with the correct form of the verbs in brackets.

(Hoàn thành bài phỏng vấn với một phi hành gia bằng cách chia động từ trong ngoặc ở dạng đúng.)

Interviewer: Good afternoon, Colin. How are the preparations for the next mission going?

Astronaut: Very well, thanks. If the weather(1) _______ (be) good, we'll leave Earth on Friday, then if everything goes well, we (2) _______ (reach) the space station in two days.

Interviewer: Could anything go wrong?

Astronaut: Of course. For example, the weather might be bad. If that happened, we (3) _______ (wait) until it got better. Also, if any of the rocket's systems (4) _______ (fail), we would use the emergency spacecraft to return to Earth.

Interviewer: Well, let's hope everything goes well. What do people need to do if they (5) _______ (want) to see the space station from Earth?

Astronaut: Well, you (6) _______ (not see) the space station unless you have a good telescope. If you want to know when it passes over your area, (7) _______ (check) on our website.

Interviewer: Thanks very much, Colin, and good luck!

4. Use the prompts to write conditional sentences. Use the words in brackets.

(Sử dụng lời nhắc để viết câu điều kiện. Sử dụng các từ trong ngoặc.)

1. If / I / have / enough money /I/ buy / telescope (would)

______________________________________________________________

2. if /rain /weekend /we / visit /planetarium (we'll)

______________________________________________________________

3. I / travel / more / if / have / more time (had)

______________________________________________________________

4. if / the computer / get / too hot /switch / it / off (gets)

______________________________________________________________

5. my parents / not happy / if / I / not pass / my exams (won't)

______________________________________________________________

5. Complete the text with the correct form of the verbs in brackets.

(Hoàn thành văn bản bằng dạng đúng của động từ trong ngoặc.)

Build your own telescope

If you want (1) _______ (want) to see the stars and planets, you (2) _______ (can) make your own telescope. All you need is a cardboard tube - the ones you (3) _______ (use) if you want to send a poster by mail - and a couple of lenses. Make sure you cut the tube very straight. This is important, as you (4) _______ (not be able to) change the focus unless it (5) _______ (be) absolutely straight. Then attach the lenses inside the tube. You can just slide them in, but if you (6) _______ (need) to make them secure, glue them in carefully. Finally, cover the other end of the tube with card and make a small hole in the end to look through. Now you're ready to look at the stars! It's not the world's most powerful telescope, but if you (7) _______ (use) it on a clear night, you will get some good views. If I (8) _______ (not have) mine, I wouldn't see so much of the night sky.