Talk to your teacher and you will get help ____

1I won’t go to tomorrow’s party _____ I am invited. （2014长沙）
A.if
B.unless
C.When
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2—I can hardly believe my eyes. Is that you, Lucy、—Ye s. It has been almost 20 years _____ we were together. （2014黄冈）
A.since
B.before
C.after
D.until
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3He’s not a perfect child. He sometimes talks back _____ his parents talk with him.（2014河南）
A.if
B.before
C.when
D.until
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4—Would you like to hang out with me、—I’d love to. _____ I have to study for the test. （2014云南曲靖）
A.and
B.so
C.but
D.or
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5They are in the same school, _____ in different classes. （2014福建漳州）
A.and
B.or
C.but
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6It’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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7Eric arrived on time, _____ it was the rush hour. （2014河北）
A.although
B.because
C.while
D.unless
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8Diana isn’t here, _____ leave a message on her desk. （2014河北）
A.or
B.so
C.and
D.but
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9He’s not a perfect child. He sometimes talks back _____ his parents talk with him. （2014河南）
A.if
B.before
C.when
D.until
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10Don’t run in the classroom, _____ you may hurt yourself. （2014陕西）
A.and
B.or
C.but
D.so
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Talk to your teacher and you will get help _____ you have a problem. （2014临沂）