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20、Some projects were purposely organized to help the students learn to share things and  ________ each other.

A．stick to              B．a(chǎn)ttach to             C．relate to             D．differ from

19、—Tom was caught stealing in a supermarket．

—It ________ be true! He is above that sort of things．

A．mustn't             B．can't           C．may not                 D．shouldn't

18、—I didn't see Tom in the party．

—He was ill，________ he didn't come. 

A．in case             B．a(chǎn)s if          C．now that         D．so that

17、On his first day working as the new manager，he lost no ________ in organizing his office.

A．patience            B．effort          C．time          D．chance

16、Though I haven’t seen him for a long time，I still remember ________ he was quite a short boy．

A．when             B．where             C．how                D．why

15、I know the course is hard but I am quite determined to ________ it through.

A．stick          B．see           C．check               D．try

14、The sudden quake left half the villagers ________ under their destroyed houses.

A．buried         B．to be buried           C． being buried          D． burying

13、Can you imagine ________ it was that drove him into such poverty?

A．what              B．how                C．why              D．when

12、He claimed that the company had tricked him into doing what he would not have done _____．

A．otherwise           B．however           C．forever            D．therefore

11、Meeting my uncle after all these years was an unforgettable moment，________ I will always treasure．

A． that                B．it             C．one              D．what