9. A) / B) in C) of D) on
10. A) differ B) varies C) extend D) differs
11. A) the needs B) the satisfaction C) needs D) need
12. A) on which B) to which C) which D) what
13. A) surprise B) surprised C) surprising D) striking
14. A) consisting B) comprising C) composing D) making up
15. A) talk to B) comment C) discuss D) exchange
key: BCAAA CDBCA ABCAC
