For some students, the computer serves only _____ a tool that is used to play games

y, I’m late. I got ______ in traffic.It doesn’t matter. Come in, please.

Father put the ladder(梯子)_________ the tree to pick the apples for me.

This old custom has________ since the 18th century, and remains practically unchanged.

The old man _______three months ago. That’s is to say, he ________ for three months