单项选择（25分）
1.—How do you learn English？ —I learn English by _________.
A.listen to cassettes B.speak it
C.listening to cassettes D.ask the teacher
2.This is the best hour I can _________ I_________ in the past twelve years.
A.know;have had B.remember;had
C.think of;have had D.think out;had
3.If you have questions,you should ask the teacher _________help.
A.from B.on C.for D.to
4.He speaks too quickly_________.
A.understand B.write them down
C.to understand D.and write
