I don’t know _____ or not he will come . _______ he comes , I will call you .

—Mary，I don’t know ____ you can come tomorrow morning.

—No problem! I’ll be here _____I’m free then.

A. if；if???????? ?? B. if; whether???? ?? C. whether；till? ? D. whether；until

________ you can’t decide ________ to go or not, just stay at home and sleep all day.

     A. Whether, if                         B. If, whether                    C. If, weather

请根据上下文和所给的首字母，补全空格内的词，使短文通顺。

Many students are hurt or killed in d___1.___ kinds of accidents. Chen Haoyu, a teacher at Beijing No. 25 Middle School and a self-protection expert, gives young students a _2._ on how to deal with danger. If you are robbed(被抢劫), keep calm. If you can not cry for help or run away, give the robber your money. Try to r___3.__ what the man looks like and tell the p__4.__ later.

If you are in a traffic accident, and if you are h__5.___ by a car, remember the number of the car; if it is a bicycle, try to contact your parents before you let the rider go. If it is raining hard and there is lightning, don’t stay in h_6.__places and keep away from big t____7.___.

When there is a fire, get away as fast as you can. Put something w___8.___ on your body and try to find an exit(出口). Do not take the elevator! If someone is drowning(溺水) and if you can’t s__9.__, don’t get into the water. Cry out for help. Remember that danger is never as far away as you think. Look after y____10.___ at all times.

选择括号内恰当的单词或词组填入空白处，使句意完整、正确。（5分）

1.Are you going to               （join / take part in）the school rowing club?

2.I think the computer is               （used / useful）.

3.I spent two hours                （sweep / sweeping）the house yesterday.

4.The house is so expensive that I can’t               （share / afford）it.

5.Even scientists aren’t sure               （if / whether）or not there are UFOs.