题目内容：

 

1.Before you come into the room, please k _______ at the door.

2.Little Kimi could dress h     , which made his father very happy.

3.Some families in China will be a    _     to have two children if one of the parents is an only-child from 2014.

4.Last Sunday, we held a party to celebrate my grandfather’s e    birthday.

5.Though English test changes, learning English is still i____________