Unit 2 Cloning Ⅰ
单项填空1.—What are those on the________
—The________ that have fallen off the big trees
A.roofs;leavesB.rooves;leavesC.roofs;leafsD.rooves;leafs2.She always differs________ me________ how to spend the vacation
A.on;withB.with;onC.at;withD.from;in3.He undertook________ the working conditions
A.improvingB.being improvedC.to improveD . to be improved4 . Tom , Jack and Rose were named as assistant professors
Believe it or not,________ three of them were of ________ age
A./;anB./;theC.the;anD.the;the5 . I was about to give up my effort to work on the puzzle when a good idea________ me
A.beatB.struckC.attackedD.caught6.—Mom,may I play the computer games for a while
—________
Dad is in the study
A.Help yourselfB.It’s up to youC.Behave yourselfD.Go ahead7.Our school forbids________,t