1)
1. should let him play for an hour
2. You should get it serviced.
3. She should take more exercise.
4. He should take up a sport or a hobby.
2)
1. Do you think I should go out with him?
2. Which university do you think I should go to?
3. What do you think I should have?
4. How many do you think I should take?
5. What do you think I should say to her?