She was putting on her watch when the _____ broke and it fell to the ground.
| A．belt | B．strap | C．tie | D．string |
He will come ____ three days.
| A．before | B．after | C．in | D．later |
The PLA man saved the boy ____ death.
| A．of | B．from | C．to | D．on |
The group is made up____five students. And they are studying hard to make up____ the lost time.
| A．of,of | B．for,for | C．of,for | D．for,of |
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 |