7．Who put forward the plan to build a railway to connect the two cities？
8．She was excited to hear the news．
9．You happened to have known each other before．
10．They suppose him to be a manager．
C）1．to look after such a little baby
2．to be asleep
3．to dislike him more and more
4．to become a physicist
5．to see what was happening
6．to complete the task
7．to have been defeated
8．to be your friend
9．to be standing next to him
10．to be finished in class
III．A）1—5BCACA 6—10BBCDD
B）1．make himself understood 2．Not all the students 3．won't，unless 4．in a friendly way ／manner 5．kiss，good night
C）1．Waving one's arms can be accepted as crying for help．
2．Tom can't read or write in English，but can speak English well．
3．You should follow the rules of the lab when you are doing experiments．
4．Keep away from that house．There is a dangerous dog there．
5．There is a certain distance between the village and the bus sttion．
D）1．With→My 2．tried→managed 3．believing→believed 4．were→was 5．one another→each other 6．habit→custom 7．in→with 8．for→of 9．manner→manners 10．to lead→leading
IV．A）1—5BDACC6—10BDBAC11—15DBABA 16—20DBCBA
B）1—4ABCC
C）1．逗号后加and 2．第二个a去掉3．like→as 4．that→whether 5．before→after 6．they后加were 7．√8．off→from 9．anger→angry 10．it→her
D）One possible version：
Dear Tom，
Thanks for your letter．It's interesting to learn your story．Now I'd like to answer your questions．
In China，we have our own way to greet each other when we meet．In your country，friends may say “Hello！”or “Hi！”to each other．In China，people，especially old people love to ask “Have you had your meal？or “Where are you going？In fact， they really don't want to know whether you have had your meal or not，or where you are going．They just express their care or attention to you by saying so．Of course，you may feel embarrassed to hear these words．But if you stay in China a little longer，you will get used to it．
OK，does my explanation sound reasonable？
Best wishes！
Yours，
Zhu Feng
