—Look! Lily and Sally are cleaning the school laboratory.—Let’s go and join them. .
There are many people downstairs. What do you think _____?
Each of us has to write a ______ report every two weeks.
Tens years ago, there _____ full of fish in the lake .Now there are _____ fish .
The doctor did what he could _____the dying man.
-How many workers are there in your factory?-______ the workers in my factory_______ over two thousand .