Many teenagers feel no difficulty （ ） computer.

Before joining the army, he spent a lot of time in the village_____he belonged.

The father went to the door in （ ） to a knock from outside.

We should do as much as we can _____ our country better and more beautiful.

I think we should stop arguing and work together, if we want to get ______ near a solution to the problem.

My own problems seem insignificant _____ those of others.

Air pollution is obviously one of the major _____ of city life.

Give me your telephone number, （ ） I need your help.

The search party still could not decide on the （ ） of the ship.

Before the invention of refrigeration， the _____ of fish and meat must have been a problem.

My university lies in the north of the city, around （ ） high mountains.

To save energy, people have to （ ） their electricity consumption.