Ⅰ. Read and write. 读一读,写单词,完成句子。
1. litter, please.

2. off the .

3. Please on the right.

4. Please in line.

5. Don’t in library books.

1. Don't
2. Keep; grass
3. walk
4. stand
5. write

1. 图1为禁止乱扔垃圾标志，"不要乱扔垃圾"用"Don't litter"，故填Don't。
2. 图2为禁止踩踏草坪标志，"不要践踏草坪"用"Keep off the grass"，故填Keep; grass。
3. 图3为靠右行走（上楼梯），"请靠右走"用"Please walk on the right"，故填walk。
4. 图4为排队，"请排队"用"Please stand in line"，故填stand。
5. 图5为禁止在书上写字，"不要在图书馆的书上写字"用"Don't write in library books"，故填write。