21. The meeting was concerned _____ education reforms and many parents, concerned _____ the
future of their children, were present.
A. with; about B. with; with C. for; about D. about; with
22．The lost of 100 lives in the aircraft crash was a great ____.
A. incident B. event C. affair D. disaster
23. The reading club in our school welcomes those _____ of detective stories.
A. interested B. enthusiastic C. fond D. addicted
