1. 选用方框中单词的适当形式填空

copy   offer   return   communicate

1. （1） My math teacher often calls my name wrong. I want to have a good with him.
3. （2） It is impolite to borrow things without.
5. （3） When someone has problems at school, we should to help him.
7. （4） He worked out the problem by himself instead of others' answers.