21. Since the tragedies of Sept. 11th, Americans have experienced ( ) grief.
A. profound B. sound C. profile D. promised
22. It'd be great if they invited us, but don't ( ) it.
A. depend on B. decide on C. work on D. bet on
23. Drug ( ) will cause eternal mental damage to teenagers.
A. use B. abuse C. smuggling D. injection
24. X-rays are also called Rontgen rays ( )the discoveries who first put them to use.
A. in case of B. in view of C. in place of D. in honor of
25. The government gave us a ( )to build another classroom.
A. donation B. permission C. grant D. award
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