The young couple, who returned my lost wallet, left ______

1____________ your father saw you, what would he say?
A.If
B.Suppose
C.Unless
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2How can you expect him to make any progress ________ you never give him a chance to have a try?
A.when
B.unless
C.even though
D.until
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3Catherine's mother doesn't allow her to go anywhere outside the town ________ another member of the family is along.
A.without
B.if
C.unless
D.with
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4 ______ Stephon Marbury is an American, he has become a role model among Beijing basketball fans.
A.As
B.Although
C.When
D.Since
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5 _______ regular exercise is very important, it's never a good idea to exercise too close to bedtime.
A.It
B.As
C.Although
D.Unless
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6 I thought her to be nice and honest ________ we met.
A.first time
B.for the first time
C.the first time
D.for the last time
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7 She cared more about her students than her own health. That's why two years passed _____ she was treated for breast cancer.
A.since
B.before
C.after
D.until
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8Pick yourself up. Courage is doing _______ you're afraid to do.
A.that
B.what
C.how
D.whether
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9_______ that we can't get the necessary equipment, we will have to give up the experiment.
A.To assume
B.Assume
C.Assumed
D.Assuming
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10_______ he said is true.
A.What
B.That
C.Which
D.Whether
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The young couple, who returned my lost wallet, left _______ I could ask for their names.