Mary is 10 and her sister is 12. So Mary is ________

1My shoes are worn out. I will have to buy _____________.
A.a new pair
B.a new one
C.new ones
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2---I think we should buy a new house.---_____________. It costs too much money.
A.I agree
B.Good idea
C.I don’t think so
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3---This book belongs to ______. Must I return it to him right now、----No, you ___________.
A.him; needn’t
B.he; mustn’t
C.his; didn’t
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4To keep healthy, you should take exercise regularly, _____ it’s important to eat a ___________ diet.
A.and; balance
B.but; balance
C.and; balanced
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5----Hi, you look unhappy. Who _______ you _________、----It’s my son. He failed in the exam.
A.looks; up
B.takes; off
C.lets; down
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6They haven’t decided ___with the problem of homelessness in the city.
A.how to deal
B.what to deal
C.how to do
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7----__________ it rains tomorrow、 ----We'll just have to put it off.
A.What
B.if
C.What if
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8He was always __________ jokes and making people laugh.
A.saying
B.speaking
C.telling
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9I watched him __________ across the street, then went home.
A.walking
B.walk
C.to walk
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10---Nancy, how long does it take to fly to Canada、---Sorry, I don’t know. But I can telephone my father to ___it for you.
A.find
B.check
C.catch
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Mary is 10 and her sister is 12. So Mary is _________ her sister.