That the guest of honor must be first to take leave after a formal dinner was in former times so fixed a rule that everyone else used to sit on and on.( )
A. 过去,正式宴会后客人告辞的顺序有严格的讲究。
B. 以前,正式宴会后贵宾和其他人都不会马上告辞。
C. 过去,正式宴会后按照规矩贵宾不告辞其他人就不能走。
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The color of one’s skin should be of no barrier ( )success in life.
A. to
B. at
C. in
D. on
If either Tom or Betty( ),he or she will help me with my questions on English.
A. come
B. came
C. comes
D. has come
Only when you have acquired a good knowledge of the field( ).
A. you can pass the exam
B. you passed the exam
C. can you pass the exam
D. you will pass the exam
The temperature( ), the chemical reaction is being speeded up.
A. rises
B. risen
C. rose
D. rising
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