--- You may refuse my invitation , but you must explain why . --- Oh, I must , _____ ?
By serving others, a person focuses on someone other than himself or herself,_____can be very eye---opening and rewarding.
Only ticket-holders were __________ to the stadium for the concert given by Jay Chou, so many of his fans were turned away.
I don’t think he was happy although he lived in a rich family, _______?
________ some of the orange juice and perhaps you will like it.
If you ________ Beijing Duck,I'd like to treat you to a meal at a famous duck restaurant.