1. The pilot was forced ... the plane.
a) landing
b) to land
c) landed
d) to be landed

2. It's a good idea for them ... gerunds and infinitives because they want to speak English fluently.
a) to study
b) study
c) studied
d) having studied

3. The teacher opened the window in order ... some fresh air in the room.
a) let
b) letting
c) to let
d) to have let

4. Nuclear physics is too difficult ...
a) understand
b) understood
c) understanding
d) to understand

5. He expected ... to the party, but he wasn't.
a) to invite
b) to be invited
c) invite
d) invited

6. John is fortunate now ... a scholarship last month.
a) to give
b) given
c) to have been given
d) giving

7. Every hour he stops his work ... a cigarette.
a) to smoke
b) smoking
c) to have smoked
d) smoke

8. You are likely ... the book in our library.
a) finding
b) to find
c) found
d) to be found

9. Three men are reported ... in the accident.
a) to injure
b) injuring
c) injured
d) to have been injured

10. Something made them ... the meeting early.
a) to leave
b) left
c) leave
d) to be left

11. Several minutes ago he saw them ... in the entrance hall.
a) to talk
b) talking
c) talked
d) have talked

12. Where can I have my umbrella ...?
a) to mend
b) mending
c) mend
d) mended

13. ... all her shopping she went home.
a) To do
b) Done
c) Having done
d) To be done

14. Her daughter sat quite silent, with her eyes ... on the ground.
a) to fix
b) fixed
c) fixing
d) have fixed

15. Why don't you have your piano ... ?
a) to tune
b) tuning
c) tune
d) tuned

16. Then he looked out of the window and saw clouds ... in the sky.
a) gathering
b) to gather
c) gathered
d) to be gathered