—David, are you listening to me?
—Sorry, Dad. I ________ to make sense of what the reporter said.
| A．was trying | B．have tried |
| C．am trying | D．tried |
—What do you think made Celia so happy?
—________a prize in the recent competition.
| A．As she won | B．Won |
| C．Winning | D．Because of winning |
The wrong you have done to him is terrible，________， in my opinion，you should apologize to him.
| A．which | B．that |
| C．what | D．for which |
Those who have ________ floods and sandstorms know the importance of
environmental protection.
| A．gone over | B．gone through |
| C．got through | D．got over |
You'd better ________ some money for special use.
| A．pick up | B．set aside |
| C．put off | D．give away |
To ________ it simply, if you don't apologize to him，you will lose this friend.
| A．put | B．make | C．speak | D．talk |