It was really very dangerous; you ____ him seriously if I didn’t stop you.
| A．might have injured | B．could injure |
| C．should have injured | D．must injure |
The boy is waiting ____ his sister and they will go to the hospital to wait ____ their sick mother.
| A．for,on | B．on,for | C．for,for | D．on.on |
Fresh air is good ____ your health.
| A．at | B．for | C．of | D．to |
It's very kind____ you to repair the bike ____ me.
| A．for.for | B．of,of | C．of,for | D．for,of |
We go to school ____ a bike.
| A．in | B．on | C．by | D．ove |
It happened ____ the Long March.
| A．during | B．in | C．at | D．for |