11. In communication, a smile is usually ______ strong sign of ______ friendly and open attitude.
A. the; / B. a; an C. a; a D. the; an
12. You’d better spend your time just on the things you find ______.
A. worth doing them B. worth being done
C. worthy of doing them D. worthy of being done
13. — Hi, what did our monitor say just now?
— Every boy and every girl as well as teachers who are to visit Water Cube ______ asked to be at
school gate before 6∶30 tomorrow morning.
A. is B. were C. are D. was
