When has the country been open to internationaltrade?—_____1978 , Isuppose

Shanghai is the city ______ the 2010 world Expo is held. –So it is a city____ most of us want to vist this summer.

The old lady isseriously ill we can’t tell her about the death of his son.

_________ has Liu Xiang taken part in world’s competitions of 110-metre hurdles?— I’ve no idea. Let’s find it out on the Internet.

Excuse me , Sir . But smoking is not allowed here. —Sorry, I didn’t see the sign. I’ll ___________________ my cigarette at once.