1 “what’s the matter?'‘ the girl asked ( in ) surpise

固定用法 ：in surprise 吃惊的

2 who's ( on )duty today?

固定用法：on duty 值日

3 we arrived ( at )the train station at seven thirty

固定用法：arrive at 到达( 小地方）； arrive in 到达（大地方）

4 they often play volleyball ( after ) class

固定用法：after class 下课后

5 who are you waiting （ for ）？

固定用法：wait for 等待

6 （ Without ）thinking，the boy answered，“two and three is six.‘'

without doing sth 没有做某事。

7 the man spends a lot of money （ on ）books every month

固定用法：spend ... on sth 花费……做……

加油！不明白再问！如果帮到你，请采纳，谢谢！