A tall building has been set up in （ ）was a wasteland before.

This zoo is not the only place（ ）the animal can be seen. 

​You could look for a job in big cities（ ）workers are better paid.

I wonder（ ）we could have a talk after the meeting.

A poet and artist（ ）coming to speak to us about Chinese literature and painting tomorrow afternoon.

— Do you like talking with your friends on the phone or through the Internet?

—（ ）. I enjoy writing letters.

Over a hundred people expressed their worries, but（ ）were willing to help.

There are five language labs in this building.One is on the second floor and（ ）on the third floor.

No other city has ever developed as fast as（ ）.

— Have you got a camera?
— No. I should buy（ ）.

Little baby knows that he should not take the things that do not belong to（ ）.

Someone is knocking at the door, but whom can（ ）be?

The children were required to wear new school clothes, but Kim couldn't afford（ ）

 When you introduce me to Mr Smith, could you please say（ ）for me?

After working for two hours, I found（ ）impossible to complete the paper in time.

Only then（ ）that she had made a mistake.

Tim went to work on the farm last week, and（ ）.

We'd like to know the reason（ ）she didn't accept the job.

Only then（ ）that he was wrong. 

At the foot of the mountain（ ）.