题目内容

The color of one’s skin should be of no barrier ( )success in life.

A. to
B. at
C. in
D. on

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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

I remember my father once( )me a story about Edison.

A. tells
B. telling
C. tell
D. should tell