ⅰ.单项填空 1．—what are those on the________？ —the________ that have fallen off the big trees. a．roofs；leaves b．rooves；leaves c．roofs；leafs d．rooves；leafs 2．she always differs________ me________ how to spend the vacation. a．on；with b．with；on c．at；with d．from；in 3．he undertook________ the working conditions. a．improving b．being improved c．to improve d．to be improved 4．tom，jack and rose were named as assistant professors.believe it or not，________ three of them were of ________ age. a．/；an b．/；the c．the；an d．the；the 5．i was about to give up my effort to work on the puzzle when a good idea________ me. a．beat b．struck c．attacked d．caught 6．—mom，may i play the computer games for a while? —________！dad is in the study. a．help yourself b．it’s up to you c．behave yourself d．go ahead
