____ he has made up his mind to do something, nothing will stop him.
| A．Once | B．Before | C．Although | D．As if |
34. ---You have given us a wonderful Chinese dinner, Mrs. Wang.
---_________________.
| A．Oh, I’m afraid I didn’t cook very well | B．I’m glad you enjoyed it |
| C．Come again when you are free | D．It’s not necessary for you to say so |
33. He got well-prepared for the job interview, for he couldn’t risk the good opportunity______.
| A．to lose | B．losing | C．to be lost | D．being lost |
32．_____from lightweight materials，the robots are about the size of a human arm or
smaller．
| A．To build | B．Being built | C．Having built | D．Built |
31．The fact that smoking is harmful to health is____most smokers are quite aware of．
| A．what | B．which | C．where | D．That |
30.It was_________ back home after the experiment.
| A．not until midnight did he go | B．until midnight that he didn’t go |
| C．not until midnight that he went | D．until midnight when he didn’t go |