（贵州贵阳）In China and some other countries，it is impolite to speak loudly________you are having a meal．
A．before
B．while
C．after
34. -Have you found the information about the famous people ______ you can use for the report?
-Not yet. I’ll search some on the Internet.
| A．who | B．what | C．whom | D．which |
. Many Chinese students think science subjects are ______ foreign languages.
| A．more difficult as | B．less difficult than |
| C．much difficult than | D．so difficult as |
. We have two rooms ______, but I can’t decide ______.
| A．to live, to choose which one | B．lived, choose which one |
| C．to live in, which one to choose | D．live, which one |
. In the past few years there ______ great changes in my hometown.
| A．have been | B．were | C．had been | D．are |
. -He didn’t go to the lecture this morning, did he?
-______. Though he was not feeling very well.
| A．No, he didn’t. | B．Yes, he did. | C．No, he did. | D．Yes, he didn’t. |