The workers in HuaShan Mountains have to rubbish to keep the mountains clean.

Miss Gu is _____ teacher. She teaches ____ Chinese.

Bill， can I get you anything to drink— __________.

Can you think of some cases______ drivers obviouslyknew the traffic rules but he didn’t obey them.

I have experienced quite a number of cases ______ I really wanted to help but could not find anything to _______.