---______do you usually go to school?
---By bus.
A. How long B When C How D How often
What can we students do _____ the environment?
| A．to protect | B．protected |
| C．protecting | D．protects |
Fruit and vegetables are good for us. We need them __________ healthy.
| A．keep | B．keeping |
| C．to keep | D．keeps |
Nowadays, if people don't want to cook, they can choose to eat out, but they are asked ______waste any food.
| A．not to | B．not |
| C．to | D．don't |
- Dad, why must I stop______ computer games?
- For your health， my boy.
| A．play | B．to play |
| C．to playing | D．playing |
—Let’s _________ some chicken. —Great! I like chicken.
| A．like | B．has | C．to have | D．eat |