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—We're doing a lot to protect our environment, but it is not good enough. —So we should try______ to look after it.

A．hard

B．harder

C．hardest

D．hardly

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-Would you mind my opening the window?
-__________.

A．No, not at all	B．Sorry, I’ll do it right away
C．Yes, please	D．I’ll be glad to

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EverydayIspendtwohours______myhomework.

A．finishingtodo	B．finishingdoing
C．tofinishtodo	D．tofinishdoing

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He’s got a birthday cake____ his ____ birthday.

A．on ，thirteen	B．for ,thirteen
C．on ,thirteenth	D．in ,thirteen

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He has been running______.

A．since two hours	B．for two o’clock
C．two hours ago	D．for two hours

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We’ve been _____ for her for 5 hours.

A．wait

B．waiting

C．to wait

D．waited

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