As ______ child, Salk did not show any interest in ______ medicine or science in general．
| A．不填; 不填 | B．the; 不填 |
| C．a; 不填 | D．a; the |
Please correct the mistakes ________.
| A．if there are | B．there are mistakes |
| C．if any | D．if any mistakes |
The ________ look on his face sug
gested he ________ that.
| A．surprising, hadn’t expected | B．surprising, should expect |
| C．surprised, wouldn’t have expected | D．surprised, hadn’t expected |
Attention, please! And keep ________ when I am taking a photograph of you.
| A．still | B．calm | C．quiet | D．silent |
______ him to do like this, he wouldn’t have made such a serious mistake in his
writing.
| A．Did you persuade | B．Had you persuaded |
| C．If you should persuade | D．If you persuade |
The house is too old. It requires ________.
| A．to repair | B．repairing |
| C．repaired | D．repair |