The students successfully finished the experiments in the lab under the teacher’s _______ and handed in the report before the deadline.
In China, a good many traditional customs have____.
---May I go to the cinema this evening? ---____. We should do the voluntary work in the nursing house.
It is dark outside, so please____ your step while going down the stairs.
I’m not a little hungry now, but I____ enough at lunch.
We will appreciate____ if your parents can help us.