.Although it seemed to be _______ painful experience, he still found it_______ fun.
Now the air in Yancheng is _______ than it used to be . Something must be done to stop it .
Miss Liu is _________ English teacher. She teaches _______ English very well.
_______ bad weather ! I can do nothing but to stay in bed for the whole day.
---How long did it _____ you to work out the difficult maths problems? ---I ______ about half an hour on it .
It is very _______ of you to speak in front of all those people .