分层限时跟踪练

　　Ⅰ.单句语法填空

　　1．These early settlers owed(owe) their survival to hard work and determination to succeed.

　　2．When the clock strikes(strike) six，the children go home for dinner.

　　3．We are working on the assumption(assume) that it was a gas explosion.

　　4．There is not much difference(differ) in price between the two computers.

　　5．It is forbidden(forbid) to sell alcohol to those under the age of 18 here.

　　Ⅱ.单句改错

　　1．It remains to be seen if the newly formed committee's policy can be put into practice.

　　if→weather

　　2．She sent the word that she would be late.

　　去掉the

　　3．Whether we need to spend more time on the project have not been discussed.

　　have→has

　　4．We may ask her a few questions to make sure we know exactly what she wants.

　　【答案】　exact→exactly

　　5．Lots of people don't bother go through a marriage ceremony these days.

　　____________________________________________________

　　【答案】　bother后加to

　　Ⅲ.完成句子

　　1．他是否要参加这次会议还没有确定呢。(whether)

　　Whether_he_will_attend_the_meeting_or_not has not been decided.

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