--I’m exhausted. I ______ on a design day and night.--You’d better have several days off after finishing it. Otherwise you might break down.
It is obvious that talking about something behind others is what everyone will not ______.
The children are having a good time, ______ with sand, others with toys.
The reason ______ his coming to China is ______ he wants to study in China.
On the opposite wall _____ one map _____ dozens of pictures.
---____ will we have to go? ---Just one mile.Keep walking.