chọn a/b/c/d, giúp m với m cần gấp a

11. The authority gathered those villagers ____ they explained the importance of
forests.
A. who B. whom C. to whom D. to that
12. He is only one boy____ in this game.
A. who participating B. participated C. to participate D. who participate.
13. This is the seventh person____ late.
A. coming B. to come C. come D. all are correct
14. The United States consists of fifty states, ______ has its own government. 
A. they each B. each of which C. hence each D. each of that 
15. I saw a lot of new people at the party, _______ seemed familiar.
A. some of whom B. some of who C. whom D. some of that
16. The concert ____ I listened last weekend was boring.

A. to that B. to which C. about which D. for which
17. I like the village ____ I used to live.
A. in that B. in where C. which D. in which
18. The little girl ____ I borrowed this pen has gone.
A. at whom B. for whom C. to whom D. from whom
19. The knife ____ we cut bread is very sharp.
A. with that B. which C. with which D. that
20. The authority gathered those villagers ____ they explained the importance of
forests.
A. who B. whom C. to whom D. to that
21. The speech ___ we listened last night was information.
A. to which B. which to C. to that D. that