The police are looking for a missing boy who is believed ______ a white pullover and blue jeans.

Rather than ___ on a crowded bus, he always prefers _____ a bicycle.

The manager told us that _______ careful we are, ________ mistakes we’ll make.

— Mrs.Smith,please teach me how to draw on the computer today.—Oh,no. ____.You have to get familiar with the keyboard first.

________five minutes________ before the last train left, we arrived at the station.