改错 (每题2分，共10分)
Mr. Green has a unhappy family. He lives happily with friends.
A      B             注意时态和        C         D
Thanks for your help, I finally passed the final exam.
A      B          C            D
Zoosare very importantplace.
A   B        C     D
I have been to China for over 20 years.
A      B           C     D
I was very surprise to find hardly anyone there when I visited the zoo.
A        B          C                D