IV．单句改错：

1．We made several American friends in New York so as to improve our English better．

2．The doctor told the patient to take the medicine each four hours．

 3．The children are taking active part in the English speech contest．
4．I prefer staying at home to play with him outside．
5．Last Sunday our team won theirs in the football match．
6．I’ll have my computer repair tomorrow．
7．The children were exciting at the news that their parents would return from abroad．
8．Several football teams competed for the match．
9．Would you please join us for a walk？
10．We’ll sing and dance until a lot of them take part in．