题目内容：

根据句意及首字母提示写单词，使句子意思完整、语法正确，每空一词。

1.People use dogs to help find things because dogs have a very good s________ of smell.

2.Jack a_________ a concert yesterday and it was wonderful.

3.-What is the noise?

- There must be someone k__________ at the door.

4.He p_______ coffee to tea. His favorite is coffee.

5.In her s_________ time, she likes playing chess with others.