问题

Do you want to be healthy–________.Smiling can help you stay healthy.

A:Smile
B:Smiling
C:Smiles
D:To smile;

正确答案是：

同类题型

I always go to sleep ___________ the light on.

Noise is unpleasant, _____ when you are trying to sleep

The howto book can be of helpto________wants to do the job.

On Christmas Eve, we put up some balloons to ______ the festival atmosphere.

The plan _______ to be a perfect one. [ ]