1. You should _____ smoking.
a. to stop
b. stop
c. not

2. What do you think I _____ do?
a. should
b. should to
c. shouldn't to

3. People should ________ that the world has changed.
a. understanding
b. understand
c. to understand

4. Those children ________ be at school.
a. they should
b. should to
c. should

5. That motorcyclist _____ be wearing a helmet.
a. shoulds
b. should
c. should to

6. You paid €99? It _____ have cost more than €50.
a. should'd
b. should to
c. shouldn't
7. If I won the lottery I _____ buy a castle.

a. will
b. should
c. should to

8. If I were you I _____ complain.
a. shouldn't
b. should to not
c. should not to

9. The teacher demanded that John should _____ harder.
a. works
b. to work
c. work

10. Jack: Get me a drink. Jill: ________ I? Get your own!
a. How should
b. Why should
c. Shouldn't
Quien me ayuda por favor