There is a great selection of books on that topic.
A. difference
B. choice
C. need
D. lack
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Many children complained that readable books were rare those days.
A. cheap
B. interesting
C. easy
D. serious
I’m sorry, I thought those letters had already been sent. It seems that I was misinformed.
A. not informed
B. incompletely ordered
C. given little information
D. wrongly told
It proved to be a fruitful meeting.
A. productive
B. lively
C. popular
D. crowded
Man’s achievement on earth is great; however, he has been endangered by breaking the balance of nature.
A. in danger
B. in trouble
C. defeated
D. creating danger