题目内容：

在下列各句的空格内填上一个适当的完整的单词，该词的首字母已给。

1.In autumn the leaves of most trees turn y________.

2.There’s no b________ over the river. We have to cross it by boat.

3.It’s best to water plants either e________ in the morning or late at night.

4.Many children like spending much money in b________ beautiful pencil boxes.

5.Before you come into the room, please k ________ at the door.

story   practice   find   notebook  but