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    35.----- Can you use chopsticks, John?

    　 ----- ________ . I once stayed in China for two years.

    A．No problem　　 　　　　　　　　　　　　　　　 B．It all depends

    C．I’m sorry, but yes　　　　　　　　　 D．You can forget it

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    34.Since the Obama administration took office, the China-US relations ________ positive development thanks to joint efforts of both sides, President Hu said at the Nuclear Security　 Summit in Washington, April,12,2010.

    A．witnessed　　 　　　 B．were witnessed　　 C．had witnessed　　 　　 D．have witnessed

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    33.The other day I was showing the boys the weekly chemistry experiment when, ________ I knew it, the mixture was bubbling over everywhere.

    　 　 A．if　　 　　　　　　　　 B．before　　　　　　　　 C．though　　 　　　 D．unless

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