Pollution does great harm to our health. It’s necessary the environment.
| A．of us to protect | B．for us to protect |
| C．of us protecting | D．for us protecting |
John often teaches physics in his free time.
| A．him | B．he | C．himself | D．his |
The doctor told me to eat more _______ because it's good for my health.
| A．orange | B．vegetables | C．ice cream | D．fish |
After two ____ work, Tom was too tried to move.
| A．day | B．days | C．days' | D．day's |
A number of ______are on in the museum. Let’s see them tomorrow.
| A．works | B．painting | C．film | D．jobs |
Pork is healthy ______ and tea is a healthy ______ .
| A．drink; food | B．drink; drink |
| C．food; drink | D．food; food |