Ex6.

1. C

2. D 

3. C

4. A

5. D

Ex7.

1. If you're vegetarian, you won't eat meat.

2. If you live in a cold country, you won't like hot weather.

3. If you're a teacher, you will have to work very hard.

4. If you're a mechanics, you will understand engines.

5. If you read newspapers, you will know what's happening in the world.

Ex8.

1. This is the first time I have seen this such as interesting film.

2. It's over three months since Tom's hair last cut

3. It's ten years since I last met him.

4. Unless you stop eating, you will be sick.

5. Unless we try to save our sources of energy, it will soon end.

Ex6

1. C

2. D

3. B

4. A

5. D

Ex7

1. If you're a vegetarian, you will not eat meat.

2. If you live in a cold country, you will not like hot weather.

3. If you are a teacher, you will have to work very hard.

4. If you do a lot of exercise, you will stay fit and healthy.

5. If you're a mechanic, you will understand engines.

6. If you read newspaper, you will know what's happening in the world.

Ex8

1. This is the most interesting film I have ever seen.

2. It's over three months since Tom last had his hair cut.

3. It's ten years since I last met him.

4. Unless you stop eating, you will be sick.

5. Unless we try to save our resources of energy, they will soon end.