The students handed in their test papers to their teacher ______.
| A．one after one |
| B．one after another |
| C．1ittle by little |
| D．step by step |
—Sorry, I forgot to lock the door.
—______ Mike can do it later.
| A．No way | B．Take your time |
| C．Nothing serious | D．You're welcome |
Peter willhis post as the head of the travel agency at the end of next month.
| A． | take up | B． | put up |
| C． | add up | D． | break up |
At college, Barack Obama didn’t know that he the first black president of the United States of America.
| A．was to become | B．becomes |
| C．is to become | D．became |
Ellen is a fantastic dancer. I wish Ias well as her.
| A． | dance | B． | will dance |
| C． | had danced | D． | danced |
Maryreally hard on his book and thinks he’ll have finished it by Friday.
| A．worked | B．has been working |
| C．had worked | D．has worked |