Unit 15

I. 1) T; 2) F; 3) T; 4) T; 5) F; 6) T; 7) T; 8) F; 9) T; 10) T.

II. a. all, none; b. either, both; c. both, neither; d. every; e. each; f. each, g. no, every; h. every; i. each; j. either, both.

III. a. I won’t come unless they invite me.

b. Supposing he left you, what would you do?

c. I’ll join the tennis club provided that you join it too.

d. We’re going to install a smoke alarm in case there is a fire.

e. She won’t get that job unless she learns to speak French.

f. Imagine the lifeguard hadn’t been there, what would have happened?

g. I won’t go out this evening in case Paul rings.

h. I’ll come at 8.00 as long as that’s all right with you.

Unit 16

II. 1) c; 2) b; 3) c; 4) a; 5) b; 6) c.

III. a. If I still feel sick, I won’t go…

b. If you sold them, you’d make…

c. If I see her, I’ll tell her…

d. If Alice hadn’t gone him, she wouldn’t have met…

e. If she didn’t love him, she wouldn’t have married him.

f. If you buy … you get one free.

g. A) What would you do if you saw a ghost?

B) I’d run a mile.

h. If we had brought …, we would know…

i. If you hadn’t had…, the house would have burnt down.

j. If I were you, I’d apologize.

IV. 1. of; 2.to; 3.to; 4.of; 5.to; 6.to; 7.of; 8.of; 9.to; 10.of.

V. a. I was born in the middle of winter in 1981.

b. She bought a new car with the money her father had left in his will.

c. He walked with a limp, because he had hurt his leg playing football.

d. I usually go shopping at Tesco’s because the prices are lower.

e. I go shopping early on Saturday morning, before everyone else arrives.

f. I’m going to London today to buy a new coat for Jack.

g. You should put your money in the bank immediately.

h. Last year we went to France on holiday, but unfortunately the weather was awful.

i. She tidied up her flat quickly / She quickly tidied up her flat, because her parents were coming to stay.

j. I’ll never understand why she loves him so passionately.

Unit 17

II. 1. The computer is a counting machine used for storing, recording, analyzing and distributing large masses of information.

2. Today any task that requires processing of information is solved with the help of the computer.

3. A computer system can perform millions of operations a second.

4. In the mid-1950's the speed of main memory was about 10 ms.

5. The larger is the size of the computer memory, the quicker the computer works.

6. Irrespective of the size all computers have similar structure.

7. The computer systems consist of the input-output ports, memory and the central processor unit.

8. Information is fed into the computer with the help of punch cards, magnetic tapes, etc.

9. The computer memory stores information (programs and data).

10. CPU gives the commands, reads information, and performs operations on the data.

11. The development of the computer technologies is deeply connected with the progress in microelectronics.

12. Today there exist many artificial languages that help man communicate with the computer.

III. a. I didn’t expect to see Ben …

b. We’ve been invited to dinner…

c. I need to have a hair-cut.

d. I’m looking forward to seeing you in June.

c. I can’t decide what to have for dessert.

f. the teacher let us go home early.

g. But she made us do …

h. Do you mind waiting for a minute?

i. I’d rather have tea.

j. I suggest we wait before we…

IV. a) must be making

b) could have used/ might have climbed up

c) would have been

d) may have been joking/ can’t have spent/ must have misheard

e) should be touching down/ must be/ will already have landed

f) could be snowing/ can snow

V. 1. in; 2. on; 3.with; 4. with 5. 6.on; 7.in; 8. with 9.from; 10. from.

VI. a (3) b (9) c (2) d (10) e (11) f (6) g (5) h (8) i (4) j (7) k (1)