I have a lot of homework today.I won’t go out until ___done.

____ the floor, I found his pen lying on the ground.

Mr. Wang, a(n)_______editor and writer, is going to attend the conference to be held in Beijing next week.

We were ______ on our way to the airportbecause of the heavy snow.

t help people to find houses outside the city, but __________, we must remember that some city people want to remain where they are.