( )3. To keep __________, we should cross the road __________.
A. safe; safe B. safely; safe C. safe; safely

四、3. C

( )4. What must you __________ in the hospital?
A. don't do B. do not C. not do

四、4. C

( )5. The children are talking __________ medicine __________.
A. with; safely B. about; safety C. with; safety

四、5. B

五 用所给单词的正确形式填空。
1. We must keep ____________ (quiet) in the library.
2. ____________ (play) football is his hobby. And he is good at it.
3. We should know more about the food ____________ (safe).
4. ____________ (keep) safe, you shouldn't play on the road.
5. You must ____________ (finish) your homework ____________ (one).
6. Please cross the road ____________ (slow).

五、1. quiet 2. Playing 3. safety
4. To keep 5. finish; first 6. slowly

六 按要求完成下列各题。
1. You must do your homework now. (改为否定句)
You __________ __________ your homework now.
2. I got up late yesterday morning. (改为一般疑问句)
__________ you __________ up late yesterday morning?
3. The bus stops because the light is red. (对画线部分提问)
__________ does the bus __________?
4. We must follow the rules on the road. (对画线部分提问)
__________ __________ you do on the road?

六、1. mustn’t do 2. Did; get
3. Why; stop 4. What must

七 思维拓展 完形填空。
When you are in the United Kingdom, you must be very careful in the streets 1 the traffic moves on the left. When you cross a street, you must 2 right first and then left. In the morning and in the evening when people go to work and 3 work, the streets are very 4 . You must be 5 . Always remember the traffic moves on the left.
( )1. A. but B. because C. however
( )2. A. look B. look up C. look for
( )3. A. leaving B. leaves C. leave
( )4. A. busy B. long C. dirty
( )5. A. safely B. dangerous C. careful

七、1. B 2. A 3. C 4. A 5. C