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20.When I try to understand   that prevents so many Americans from being as happy as one might expect, it seems to me that there are two causes.

    A.Why it does     B.Why it is       C.What it does     D.What it is

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19.     and angry, Marry began to cry loudly and then she ran out of the room .

    A.Disappointed                    B.Disappointing

    C.Being disappointed                D.To be disappointing

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18.-Who can help him clean the classroom ?

   -     .

    A.I             B.Me            C.Mine          D.My

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17.When he saw me coming, he   in the opposite direction.

    A.worked out      B.left off         C.took off        D.went through

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16.Another unmanned spaceship : Shen Zhou VI,     China greets a new century, marks new progress in space program.

    A.after which      B.from which      C.in which        D.with which

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15.Whether by accident or on ,     he arrived too late to help me .

    A.purpose        B.aim           C.chance         D.design

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14.-Tony , you look puzzled . Have you understand me ?

   -I’m sorry. I     another problem just now .

    A.have thought of                  B.am thinking of

    C.had thought of                   D.was thinking of

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13.Jack, I’m sorry to trouble you,     could I ask you a question?

    A.so            B.or            C.and           D.but

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12.The old mother was     to see her son off at the train station.

    A.more than a little sad               B.sad more than a little

    C.a little more than sad               D.a little more sad than

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