4. Replace the underlined words with antonyms where it is necessary:

1. Welding is a process of separating materials.

2. In friction welding one of the components is rotated at a low speed before making contact with other parts.

3. TIG process is a complicated process.

4. MIG welding process is usually chosen for joining heavier sections.

5. There is little interest by automotive manufacturers in laser beam welding.

6. Spot welding is unsuitable for the present sheet steel construction technique.

7. Spot welding is very cost effective.

8. Laser beam welding is a very high-heat-input process.

9. Zinc vapor generated during welding can interfere with the laser beam causing poor weld.

5. Put the verbs in brackets in the necessary tense:

1. The probability of replacing plasma arc welding by the TIG process (be) pretty low.

2. The present sheet steel construction technique (rely) on overlap joints.

3. The advantage of laser beam welding (be) very attractive.

4. Friction welding (be) very cost effective.

5. Manufacturers (stay) with spot welding because it (offer) many advantages.

6. This process (gain) acceptance in the aerospace industry to join aluminium tp brass.

7. In a number of applications the replacement of the plasma-arc process for the TIG process (result) in significant economies.

6. State the type of the subordinate clause.

1. I realized that they had fallen in love.

2. If you are successful, people will forgive you practically everything.

3. Will you be still using the computer when I come back to the office after lunch?

4. Although she was extremely surprised she didn't show any sign of it.

5. Since he had lost the keys, he had to break down the door.

6. As he had no alarm clock, he overslept.

7. The waiter served the food, which had been cooked by the best chef in Paris.

8. The police are looking for the woman, who had kidnapped the child.

9. They were so poor that they couldn't make both ends meet.

7. Insert what, that or which.

1. I tried to decide ... I wanted most: the meal or sleep.

2. Don't worry! I'll do ... I can.

3. Nobody will believe ... it's true.

4. Where are the coins ... were in the box?

5. We haven't got the clue ... you are talking about.

6. Why do you blame me for the things ... go wrong?

7. Did you hear ... I said? — No, ... was it?

8. Nobody knows ... he is like.

9. Relax, ... is no problem.

10. Why can't you tell me ... the problem is?

8. Choose the conjunction which fits the meaning of the sentence. In some cases more than one will fit.

1. (As, As though, As soon as) it is getting late, I suggest we break off now.

2. Nobody is to leave (until, unless, since) I say so.

3. He arrived (just as, as long as, as far as) I was leaving.

4. She cried out (although, as though, as if) she had been stung by a wasp.

5. Call in and say hello (whenever, however, wherever) you are in town.

6. (Since, Seeing that, In case) nobody else seems to want these sandwiches, I'll eat them.

7. (As soon as, Since, Now that) you leave school, you'll be able to get a good job.

8. (As far as, So that, Once) I can see, he has no intention of paying the bill.

9. (Once, Whenever, After) you have driven a Porsche, you will never want to drive any other car.