Many human activities also _______carbon gases, which will result in global warming.
| A．put off | B．send off | C．let off | D．set off |
—Haven’t seen you for ages ! Do you still work in Xi’an ?
—______. It’s four years since I worked there .
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—What were you trying to prove to the police?
—______I was last night .
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. —Have you received Jack’s plan ?
—Yes , but I don’t think his plan is______ .
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-------I bet someone stole my backpack .
-------Well , you ______ have kept an eye on it .
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We all know it will be next June ______ we can really have a rest .
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