It is pretty well understood ________ controls the flow of carbon dioxide in and out the atmosphere today．

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Generally speaking， _________ according to direction, the drug has no side effect．

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--________ me sports meet might be put off．

--Yes．it all depends on the weather.

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--Whois Jerry Copper?

--________?I saw you shaking hands with him at the meeting．

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A．Don't you meet him yet

B．Hadn't you met him yet

C．Didn't you meet him yet

D．Haven't you met him yet

--Alice，why didn't you come yesterday?

--I ________ ，but I had an unexpected guest．

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--Hi，Tracy，you look tired．

--I am tired．I ________ the living room all day．

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--The cakeis delicious!

--Well，at least it's ________ the one I baked last week．

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--How was your recent visit to Qingdao?

--It was great. We visited some friends, and spend the ________ at the

seaside.

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--Have you seen ________ pen? I left it here this morning.

--Is it ________ blue one? I think I saw it somewhere.

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--Who were those people with the banners (旗帜)?

--A group ________ itself the league of peace.

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