To pay to see that movie will be foolish when you can see it on television for___ .
A terrible earthquake struck Sichuan Province on May 12, _____ tens of thousands of lives.
--- What’s the matter with Jason. He looks a bit upset. --- Didn’t you know? When returning from his holiday last night, he found his house________.
Oh, it’s so cool in the house. You _______ have turned on the air-conditioner, haven’t you?
Fathers often feel __________ their duty to earn more money for their family.
--- ________ the class done most of the work? --- Yes, but the rest ___________ rather difficult.