51In American there are more households with pets than ______ with children.
A.those
B.these
C.ones
D.that
开始考试练习点击查看答案52I’d appreciate _____ if you would like to teach me how to use the computer.
A.that
B.it
C.this
D.you
开始考试练习点击查看答案53 caused the accident is still a complete mystery.
A.What
B.That
C.How
D.Where
开始考试练习点击查看答案54Surprisingly, Susan’s beautiful hair reached below her knees and made _____ almost an overcoat for her.
A.them
B.her
C.itself
D.herself
开始考试练习点击查看答案55After I went abroad for further study, _______ of my parents lived with me．
A.none
B.neither
C.either
D.any
开始考试练习点击查看答案56He has learned , no matter what happens and how bad seems today, life goes on and it will be better tomorrow.
A.that; it
B.it; that
C.it; it
D.that; that
开始考试练习点击查看答案57We asked John and Jerry, but ____ of them could offer a satisfactory explanation.
A.either
B.none
C.both
D.neither
开始考试练习点击查看答案58We feel _____ our duty to make our country a better place.
A.it
B.this
C.that
D.one
开始考试练习点击查看答案59. I"d really appreciate ________ if you would turn off the lights before you leave.
A.you
B.that
C.as
D.it
开始考试练习点击查看答案60People in the west make_______ a rule to buy Christmas presents for their relatives and friends.
A.it
B.that
C.this
D.as
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