Question

单句改错。
1. Cet up early tomorrow. If don't,you'll miss the first bus.
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2. I asked him to see the film,but he didn't want.
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3. -Are you a secretary?
   -No,but I used to.
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4. Work hard though young,or you'll regret.
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5. You'd better make some changes where is possible when you are reading my paper.
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Answer 1

1. don't→not  
2. want后甲to  
3. to后加 be
4.  though→when/while  
5.去掉 is或 is前加 it