1. A group of us are taking part in the conference.

2. The number of students is different in various countries.

3. A group of my friends intend to study French.

4. A number of questions in the test were really difficult.

5. A group of young teachers is in the guest-house now.

6. The number of new-comers was high last year.

7. A group of experienced doctors are leaving for London.

8. A group of experienced doctors is practising in London.

9. The number of books in the library has gone up.

10. A number of trees were swept away during the storm.

Ответ:

1)are

2)the

3)intend

4)were

5)A

6)was

7)are

8)A

9)Has

10)A