Something must ______ (do) to end the strike.

This bicycle is old, but it's still ______ (use).

Computers do much of the ______ (work) in our life.

Mary and Kate are good ______ (friend).

My father is a ________. (work)

How many________ are there in your school? (student)

His grandfather died two months ago.

= His grandfather has been ______ for two moths.

He died three years ago. He has been ______ for three years.

There are about 80 pyramids (['pirmid] n. 金字塔) in Egypt(['i:dipt] n. 埃及). They were made by the ______.

根据括号要求写出相应部分:

month (复数) ______