do you often play with at weekends — My best friend, Mary.

Hangzhou is well-known ______ the west lake_____the capital of Zhejiang.

When the man was trying to break into the bank,he was caught by the police________[ ]

I don’t know if his uncle ________. — I think he ________ if it doesn’t rain .

The rivers will become dirtier and dirtier ______ we take action to protect them.