The volunteers are doing good things for no ________.
A. reward
B. prize
C. rank
D. commission
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The two countries will develop their relationship on the ________ of mutual understanding and respect.
A. basic
B. basis
C. background
D. knowledge
Three ________ witnessed the traffic accident.
A. passer-by
B. passer-bys
C. passers-by
D. passers-bys
It’s time for you to make the final decision. Don’t ________ any more.
A. consider
B. regard
C. afraid
D. hesitate
A series of accidents ________ the whole nation.
A. sad
B. shocked
C. danger
D. angry