We are sure that our football players will do________ best.

Shen Xue and Zhao Hongbo won the gold medal for China so we’re proud _____ them. [ ]

Don’t play _____ fire. It’s very dangerous. [ ]

How did they come to school today?—Because of the rain they came to school onfoot _____ a bus.[ ]

I began watching here an hour ago, but now nothing _______ yet.