Unit3
1.____, you have studied very hard;on the othe other(hand) you have not learned as much as you need.
A.Instead    B.On the one hand     
C.Though     D.Fisrst of all
2.Mr.Smith is considering____a computer,which is considered ____a great help in our work and study.
A.to buy; to be   B.buying; to be    
C.to buy; being   D.buying; being