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2.    

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1. 已知等差数列的前n项和为,若M、N、P三点共线,O为坐标原点,且(直线MP不过点O),则等于        .

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10.(★★★★)Tom couldn’t work the problem out because he wasn’t ________ clever.

A.much             B.that              C.a little                D.as

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9.(★★★★★)It’s quite late now but Mr.Li________ hasn’t turned up.

A.yet              B.already            C.still                  D.however

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8.(★★★★)-Where have you been?

-I’ve ________ been to the library.

A.ever              B.already            C.just                  D.nearly

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7.(★★★★★)The lessons given by Mr.Smith are always________ and interesting.

A.loving            B.lovely            C.lively                D.vividly

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6.(★★★★★)-Did all of them go to the cinema?

-No.They________ went to the concert instead.

A.almost            B.mostly            C.most                 D.nearly

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5.(★★★★★)Jim is a kind boy.He is________ willing to help his classmates.

A.so               B.much             C.too                  D.such

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4.(★★★★★)It was________ impossible for him to finish the work alone by five o’clock in the morning.

A.very             B.quite             C.too                  D.much

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3.(★★★★)-Can I help you?

-Well,I’m afraid the box is________ heavy for you,but thank you all the same.

A.so               B.much             C.very                 D.too

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