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　　31He made a ____ by wise investment and became a millionaire.

　　A luck B fortune C wealth D money

　　32With the quickening change in the society， the ____ among generations has been widened.

　　A break B gap C opening D blank

　　33It was ____ of him to share his money with others in need.

　　A considerable B sincere C frank D generous

　　34Even though they're twin sisters， they have nothing in ____ except appearance.

　　A general B total C average D common

　　35It's almost ____ that he'll be elected chairman of the Students' Union.

　　A sure B certain C positive D

　　36No one dares to come close to the mysterious object as it gives _____ a terrible smell.

　　A up B in C out D off

　　37______ their small age， these children did a good job in the experiment.

　　A Given B Giving C To Give D Give

　　38He felt life meaningless， for there is nothing he can go ____.

　　A down B up C by D after

　　39The manufacturer must _____ the quality of products.

　　A convince B appoint C guarantee D assure

　　40It's easy to form the ____ of taking drugs but hard to get rid of it.

　　A habit B custom C practice D rule