Ⅰ.单句语法填空
1．Shall we have a rest or get down to doing(do) our work?
2．He accompanied her singing(sing) on a lutelike instrument.
3．We don't allow smoking(smoke) in the hall.
4．The squirrels were so lucky that they missed being caught(catch)．
5．He couldn't risk losing(lose) the opportunity.
6．Becoming(become) aware of what causes your worry will help to reduce the stress.
7．It is difficult for us to finish writing(write) the composition in an hour.
8．Using(use) mobile phones for too long tends to make us passive and ignore physical exercise.
9．It is a waste of time persuading(persuade) him to give up the plan.
10．She had to brake hard to avoid running(run) into the car in front.
