牛津上海版（深圳用）英语六年级上册Unit 10基础练（单选题）

Air is important.  _______ everywhere.

Air ______ all the living things _______.

We should make our bedroom _____ every day.

Look at the smoke. It makes the air _____.

It keeps them ______ in the sky.

Look at the plane and the birds. The air keeps ________ high in the sky.

—Shall we fly a kite in the park this Sunday？

—________

We ________ need air to keep us alive.

The air in our city ________ clean in the past, but now it ________ dirty.

—What's the matter with you？

—________