The old couple have been married for 40 years and never once ________.
A. they had quarreled B. they have quarreled
C. have they quarreled D. had they quarreled
—What is going on over there?
—They are arguing ________ each other ________ private affairs.
A. about；with B. with；about
C. with；with D. about；about
I like reading books about ________ story of Sang Lan who has ________ positive attitude towards life.
A. the；the B. a；a
C. a；/ D. the；a
I am sorry, but I didn't mean to keep you waiting here so long. Can you ________ me?
A. hesitate B. forgive
C. apologize D. satisfy
Generally speaking，the limits of a person's intelligence are fixed at birth，but whether or not he reaches those limits will ________ his environment.
A. focus on B. rely on
C. agree on D. carry on
With our knowledge ________ practice，we can make great contributions to our society.
A. to base on B. basing on
C. based on D. base on
