______ Tom______ Mary speaks good Chinese, so they communicate with these Chinese  students very well.

The world’s population is growing ______, and there is ____ land and water for growing rice.

— There used to be lots of fish in the lake.— Yes, but there are very __________ now.

I think math is as __________ as English .

—Peter’s father is a _______ math teacher.—I think so. He teaches _______.