He’s not a perfect child. He sometimes talks back ____

1Diana isn’t here, _____ leave a message on her desk. （2014河北）
A.or
B.so
C.and
D.but
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2Eric arrived on time, _____ it was the rush hour. （2014河北）
A.although
B.because
C.while
D.unless
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3It’s going to rain. You’d better take an umbrella _____ you may get wet. （2014长沙）
A.or
B.and
C.but
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4Talk to your teacher and you will get help _____ you have a problem. （2014临沂）
A.unless
B.if
C.until
D.so
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5I won’t go to tomorrow’s party _____ I am invited. （2014长沙）
A.if
B.unless
C.When
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6Don’t run in the classroom, _____ you may hurt yourself. （2014陕西）
A.and
B.or
C.but
D.so
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7They will lose the game _____ they try their best. （2014黔西南州）
A.unless
B.once
C.since
D.after
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8He didn’t go to school yesterday _____ he was ill. （2014黔西南州）
A.because
B.because of
C.if
D.so
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9I’d like to go with you, __ _____ I’m too busy. （2014北京）
A.or
B.and
C.so
D.but
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10_____ Lin Feng has to work late, she always wears a smile on her face. （2014南京）
A.Because
B.If
C.Until
D.Though
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He’s not a perfect child. He sometimes talks back _____ his parents talk with him. （2014河南）