ex. 5
1. should
2. should
3. should not
4. should not
5. should not
6. should not
7. should.
ex.6
2. When do we catch cold?
3. Where do sick children stay?
4. How often does Andy takes medicine?
5. Who visits sick children at home?
6. What do boys and girls wear in the winter?
7. Why does Jane like?
