Exer 1:
1. Something must be done quickly to solve the problem of homelessness.
--> Urgent
2. Scientists have tried very hard to find a cure for this disease.
--> Enormous effort
3. Just thinking about his face at the moment makes me laugh.
--> The very thought
4. The teachers agreed to introduce the new methods.
--> There was an agreement
5. The boy does whatever his father wants in an obedient way.
--> The boy dances to his father's tune
6. I simply fail to understand some of my colleague’s attitudes to work.
--> I have some colleagues with incomprehensible attitudes
7. I did not realize how much he was influenced by his brother.
--> I did not realize the extent of his brother's influence
8. Mass tourism has been one of the causes of the environmental problems.
--> Mass tourism is a cause of the environmental problems
9. It was six months since I stopped subscribing to that magazine.
--> I cancelled my subscription to that magazine six months ago
10. These books are on loan from the British Council library.
--> These books have been borrowed from the British Council library

Exer 2:
1. Most Of The Students Ignored What The Teacher Was Saying.
--> Few Students paid attention to what the teacher was saying.
2. It’s a waste of time denying that you did it when we’ve got proof.
--> There is no point in denying that you did it when we've got proof.
3. Joe had not expected the concert to be so good.
--> The concert was better than Joe had expected.
4. I bet you were exhausted after such a long journey.
--> You must have been exhausted after such a long journey.
5. A baker delivered the cake for us this morning.
--> We had a baker deliver the cake for us this morning.
6. I don’t know why Paul left the classroom so suddenly.
--> I don't know what made Paul leave the classroom so suddenly.
7. I haven’t caught a cold for ages.
--> I last caught a cold ages ago.
8. The Minister had to resign because of ill health.
--> Ill health led to the Minister's resignation.
9. Some people don’t respect the law.
--> Some people have no respect for the law.
10. There are fewer charities in this area than there were a few years ago.
--> There are not as many charities in this area as there were a few years ago.