Our monitor has ____ larger collection of ____ books than any other student in our class．
| A．the; 不填 | B．a; 不填 | C．a; the | D．不填;the |
He went to Beijing and returned ____ three days.
| A．in | B．before | C．later | D．after |
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 |