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--I can't find Mr. Smith.

--It was in the hotel___________ he stayed.

--Where is Xiao Wang?

--I don't know. He__________ be in the library.

You can't see the___________ now for they are having a meeting at the moment.

We can’t go on with the experiment because the computer_________.

It is the protection for the trees___________ really  matters, rather than how many trees are planted.

--Thank you very much.

--Not at all , I was____________ glad to help.

. The customer bargained with the shopkeeper for a long time, and finally they agreed ___________ the price.

--Shall Mary come and play computer games?

--No,__________ she has finished her homework.

--I'm going downtown.

--Come on.

. It is only when you nearly lose someone ____________ you fully realize how much you value him.