英语 用所给词正确形式填空

题目

英语 用所给词正确形式填空
1、The company promised _______ (return) the money to Mr.Green soon.
2、The children are having fun _______ (play) games on the playground.
3、The student had a warm discussion coming up many useful ways of ______(solve) their problems.

答案

1 to return（固定用法：promise to do sth '答应做某事')
2 playing（have fun doing sth 固定用法‘开得开心’）
3 solving （介词后的动词用ING形式）