—I’m awfully sorry I can’t go with you. —_____? Haven’t you agreed?
| A．How is it | B．What is it | C．Why don’t you | D．what do you think |
My wallet isn’t in my bag. Where I have put it？
| A．can | B．must | C．should | D．shall |
Many children may be fond of animals， but ever think of making the study of animals their career.
| A．a few | B．few | C．some | D．any |
The country has already sent up three unmanned spacecrafts， the most recent at the end of last March.
| A．has been launched | B．having been launched |
| C．being launched | D．to be launched |
．______ the satellite launch drawing near, the research workers put their hearts to the test and always stayed up late.
| A．As | B．Because | C．With | D．While |
It was in the lab, ________ was taken charge of by Professor Curie, _______ they did the experiment.
| A．where; that | B．that; that | C．which; that | D．which; where |