When he was opening the door, he was ___________ that he was being followed by a policeman.

It’s really unwise of some teenagers from low-incomefamilies to spend a large sum of money on Apple products ______ they could buyother cheaper brands

On leaving CCTV, Li Yong ______ a teaching position at the Communication University of China.

My sister is very careful. She made________ mistakes in this test.

Zhengzhou will be more and more convenient when Zhengzhou Subway_____ in two years.