Ⅰ、D A C B
Ⅱ、F T F T T
Ⅲ、（单词至上而下）C A D B
Ⅳ、1.gym
2.dining hall
3.six months ago
4.last month
Ⅴ、1.is
2.weren't
3.was
4.were
5.couldn't
Ⅵ、A：1 - 5 A B B B C
B：例 :There was no library five years ago.There is a library now. There was no art room five years ago. There is a small art room now. There were many talk trees two years ago. Now there are some small trees. There were no TVs and computers in our schoo1. There are many TVs and computers now.
Unit 4 Part B
Ⅰ、DABC
Ⅱ、
Thenweren'tverystrong；couldn'trunfastor
playbasketballwellNowcanplaybasketballwell
Ⅲ、（词组至左而右）ACB
Ⅳ、1.couldn't
2.couldn't
3.washad
4.didn't
Ⅴ、1.Itwassmall.Nowitisbig.
2.Itwasthinthen.Nowitisstrong.
3.HewasshortthenNowheistall.
Ⅵ、TFTT
Unit 4 Part C
Ⅰ、1.goswimming
2.rideabike
3.cookmeals
4.playthepiano
5.goice-skating
6.playbadminton
Ⅱ、CABCB
Ⅲ、A：1-5ABBCA
