Giải sách bài tập tiếng Anh 8 Unit 15: Computers

Unit 15: Computers

1. Write the sentences with for or since. Use the verbs in the present perfect. (Trang 128 sách Bài tập Tiếng Anh 8)

a. I have owned this computer for three years.

b. They have visited the Silicon Valley since last November.

c. Nam has been happy since he had a computer.

d. We have learned computer science for a moth.

e. She has worked at our school since the year 2000.

f. I have used those programs for two years.

g. The printer has stopped working since this morning.

h. They have known the name of the company for a long time.

i. He has read the book since 9 o'clock.

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2. Complete the sentences, using the verbs in the present perfect. (Trang 128-129 sách Bài tập Tiếng Anh 8)

a. This computer is the best one I have ever used.

b. There has been a new program for the students in the school.

c. Three more students have joined our group this week.

d. This is the fifth time he has damaged the computer.

e. Our teacher has asked the whole class to learn computer science.

f. We have found out why the printer refused to work.

3. Match the sentences in (I) with the appropriate responses in (II). (Trang 129-130 sách Bài tập Tiếng Anh 8)

a – Eb – Hc – Fd – Je – A
f – Dg – Bh – Ii – Cj – G

4. Complete the sentences with yet or already. (Trang 130 sách Bài tập Tiếng Anh 8)

a. I've started learning computer but I haven't learned very much yet.

b. I'm still trying to finish my homework. I've already been at it for hours.

c. The children are still watching TV. They haven't been to bed yet.

d. We offer to help Tim with the bike but he has already mended it.

e. Ba hasn't gone to school yet. He is still having breakfast.

f. We have already seen Titanic and we don't want to see it again.

g. Hoa posted her letter last week but he family hasn't got it yet.

h. Is Shannon still here? – No, she has already left.

i. Have you finished your homework yet or are you still working on it?

Well, I've already finished it.

5. Mrs. Quyen is now in a shopping mall. Look at her shopping list and write sentences telling what she has already bought/ done (√) and what she hasn't bought/ done (x) yet. (Trang 131 sách Bài tập Tiếng Anh 8)

a. She has already bought a pair of shoes.

b. She hasn't/ has not bought some T – shirts for Mr. Thanh yet.

c. She has already bought a handbag for her daughter.

d. She hasn't/ has not bought some souvenirs for her friends yet.

e. She hasn't/ has not bought cosmetics yet.

f. She has already bought a tea set.

g. She has already bought a pair of sun glasses.

h. She has already withdrawn some money.

i. She hasn't/ has not met an old friend at the restaurant for lunch yet.

j. She hasn't/ has not bought a roll of film yet.

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6. Write the sentences, putting the verbs in the present perfect or past simple. (Trang 132 sách Bài tập Tiếng Anh 8)

a. We built that room in October. It has been in use for five months.

b. Quyen became a famous young writer a few years ago. She has written many stories for students for ages.

c. Have you been to Disneyland? I'm glad that I had a chance to go there last year.

d. Loc has never used his computer even though he bought it a year ago.

e. I haven't seen you for ages! – No, it's just two weeks since we last met.

f. I have heard a lot about Liz Robinson but I have never seen or talked to her.

g. Ba missed his exams this morning because he overslept. He has come to class late so many times these days. He must buy an alarm clock.

h. Hoa took a train to Ha Noi yesterday. She has taken many trips there since she started her study in Ha Noi three years ago.

i. Where's Nam? Have you seen him? – Yes, he went out to buy some paper a few minutes ago.

7. Look at the pictures and the words underneath. Write the instructions to make yogurt. (Trang 132-133 sách Bài tập Tiếng Anh 8)

a. Heat the milk until it is boiled in one minute.

b. Let the milk cool (off) to about 40oC.

c. Add a cup of yogurt as a starter and stir the mixture continually for a while.

d. Pour the milk into little cups.

e. Leave the cups in a warm place for at least 5 hours.

f. When the yogurt is ready, put it in the fridge to cool it.

8. Fill in each gap in the following sentences with one word, phrase or acronym from the box. (Trang 134 sách Bài tập Tiếng Anh 8)

a. set up              f. keyboard
b. fans                g. motherboard
c. LCD                 h. CPU
d. clean               i. Green
e. click               j. hard – disk 
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9. Read and answer the multiple-choice questions. (Trang 135-136 sách Bài tập Tiếng Anh 8)

a. Ab. Bc. Dd. Be. A

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