I think the answer aew( i am not 100% sure that's right,but i will do my best):
16) - D.seen (or A.shown,but i think D is more correct then A)
17) - A.For example
18) - C.different
19) - A.very
20) - B.order
21) - A.new
22) - C.bad
23) - D.problem
24) - B.talk
25) - D.be afraid of
P.S i hope it help u a bit.