2.这些花必须每星期浇三次水。

1.句子所有的食物都已经被孩子们吃完了。

8.We should stop the boy from swimming in the river.

7.Visitors can’t feed the monkeys in the zoo.

6.Must we hand in our homework now?

5.Students should read more books in their free time.

4.Can you see them running in the playground?

3.You must keep the fish in the fridge.

2.I have already bought ten pens since last year.

1.Has the farmer sold all the apples?