1.  Don't go out. The rain is p__________ down.
2.  Don't worry. Mr Hu will be a__________ to help you work out this Maths problem.
3.  My cousin's hobby is c__________ stamps.
4.  Many v__________ come to see the Great Wall every day.
5.  One of my friends won an a__________ for his article last year.
6.  Thank you for o__________ a school trip.
7.  —Do you know the r__________ of the match?
    —Yes, it's 2: 1.
8.  Different people have different kinds of a__________.
9.  Fire is very d__________, so you have to think of your own s__________ when you play with fire.
10. Mr Green fell off his bike and hurt h__________ last week.

A. needn't
B. may not
C. mustn't
D. wouldn't