subject verb agreement

Hi
Please tell me if the answers are correct.

1. Two and two …………………………… four.
a) is b) are c) has d) Either is or are

2. Nobody was late, ………………………….. they?
a) was b) were c) is d) are

3. A serious problem in our garden ……………………….. wasps. a) is b) are c) have d) Either is or are

4. Nobody except his best friends ………………………….. him. a) like b) likes c) is liking d) are liking

5. My baggage ………………………… sent to Paris by mistake. a) have been b) has been c) were sent d) had sent

6. Romeo and Juliet ……………………… one of Shakespeare’s most popular plays.
a) is b) was c) are d) were

7. . The Prime Minister, as well as some of his Cabinet Ministers, ………………………… in opening up the economy.
a) believe b) believes c) is believing d) are believing

8. Your ………………………… pretty.
a) hair is b) hairs are c) hair are d) hair have been

9. A number of people …………………………… trying to immigrate.
a) is b) are c) have d) Either is or are

10. A group of us ……………………………. going on holiday next week.
a) is b) are c) have been d) Either is or are