do.

例句：

1. 1. I need to do my homework before dinner.
   我需要在晚餐前完成我的作业。
2. 2. The teacher asked us to do the experiment together.
   老师要求我们一起做实验。
3. 3.Do you want to go for a walk after lunch?
   午饭后你想去散步吗？