I。1~5 CBBCB 6~10 BCCCB
II。1。to learn 2。really 3。to watch 4。healthy 5。pronunciation 6。musicians 7。were 8。used
9。
  preferred 10。has been
III。1。home to 2。what else 3。stay away 4。head of 5。interstted in
IV。1。doesn't need 2。
  where would 3。has he 4。easy enough 5。not to
V。1~5 BAEDC
VI。1~5 ABADC 6~10 BACBD
VII。1~5 ADBDD
6。
  Yes
7。we can talk to them,play and go to the cinema with them
8。Because we can 't live alone in the world
9。
  some people always expect to make use of their friedns
10。Having a real good friend is better than having many friends
11。
  plant 12。across 13。banks 14。destroyed 15。changing。