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
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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
I’d rather you ( ) anything about it for the time being.
A. didn’t do
B. not do
C. not to do
D. don’t have to