[2] I couldn't stop ( ).

我忍不住笑个不停。

A、laugh B、to laugh C、laughing D、laughed

[3] I stopped ( ) up a letter that I'd dropped.

我停下脚步，捡起我掉在地上的信。

A、pick B、to pick C、picking D、picked

[4] You’ve been working hard all day, you should stop soon ( ).

你已经辛苦工作了一整天了，你应该马上停下来休息。

A、rest B、to rest C、resting D、rested

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