They were surprised that a four-year-old boy should work out such a difficult problem
____they themselves couldn’t.
| A．once | B．then | C．while | D．if |
That was really a splendid evening. It's years________I enjoyed myself so much.
| A．when | B．that | C．before | D．since |
—I went to the beach and got plenty of rest.
—________. You looked tired last time I saw you.
| A．I had hoped so. | B．Really? |
| C．I'm glad you did. | D．That sounds a good idea. |
—Do you mind if I smoke here?
—________.
| A．Of course not.It's not allowed here |
| B．No，you can't |
| C．I'd rather you didn't actually |
| D．Great! I also like smoking |
Can those________at the back of the classroom hear me?
| A．seated | B．sit | C．seat | D．sat |
At the opening________of the school, our headmaster gave a short speech.
| A．ceremony | B．form | C．matter | D．event |