21. The radio club in our school, which is in _____ charge of Hao Zhe, is much more than just ____ music for everyone.
A. /; / B. /; the C. the; / D. the; the
22. --- Would you like to _____ Professor Smith’s lecture this Sunday?
--- Sorry, I have an important meeting to _______.
A. attend; join B. join; attend C. join; take part in D. attend; attend
