Look at these factories. I hate them. They____ many rivers here. –Yes. Something ______ to stop the pollution.

Miss Gao is strict______herself______everything. [ ]

What are you doing _____vacation?— I’ m going hiking.[ ]

You can watch TV ______, but you can’t watch it ______ a long time.

We _______ talk loudly when we see the sign “ Be quiet ”on the right.