21. ______ school trip is expected to last one day, so bring ______ packed lunch with you.
A. A; a B. The; the C. The; a D. The; /
22. —It’s so hot. What about getting a drink?
—Good idea. It’s my _______today.
A. treat B. charge C. trade D. cost
23. The chairman was wondering why some members of the organization wished to ______
and form a new one.
A. break down B. break in C. break away D. break out
