We are happy ______ you ______ the party for our friends from Canada.

The Green Great wall can stop the wind and the sand ____to the rich land in the south of China.

ildren, _____ had played the whole day long,were worn out.

What a terrible flood!—-Yes. We must try to prevent the flood ________ the fish in the river.

Youcan get off the bus one or two stops ________ and walk the rest of the way towork every day so as to take some exercise