42．A．since                   B．when                   C．after                             D．before

41．A．protect                B．fight                    C．save                      D．try

40．A．light                    B．hard                    C．thick                      D．thin

39．A．every                         B．one                     C．all                         D．most

38．A．say                      B．talk                     C．tell                        D．speak

37．A．let                       B．changed               C．taken                     D．made

36．A．also                     B．ton                      C．either                     D．neither

35．一Do you want to visit Beijing．John?

    一Pardon，what did you say just now?

    ―I asked __________you ______to visit Beijing．

    A．if；want              B．if；wanted           C．that；want             D．that；wanted

    Hundreds of years ago，life was much harder than today．People couldn’t use modem machines．Of course，there was no modem machine， 36 ．

    Life today is better，but there are new problems．One of the biggest problems is pollution．Water pollution has  37  our rivers and lakes dirty．It kills our fish and affects our drinking water．Noise pollution makes us  38  louder and become angry more easily．Air pollution is the most serious kind of pollution．It affects  39   living thing in the world．

    Cars，planes and factories all pollute our air every day．Sometimes the pollution is so  40 that it is like a quilt（被子）covers a city．This kind of quilt is called smog（雾）．

    Many countries are making new laws to  41  pollution．Factories must now clean waste water   42  it is thrown away，and they mustn’t blow dirty smoke into the air．

    We need to do many other things．We can put waste things in the dustbin  43  throwing them on the ground．We can go to work by bus  44  go to our office with our Mends in a car．

    If the traffic is less and  45  ．the pollution will be less．And the environment will be better and better．

34．Herry hasn’t phoned us ______he went to London．

    A．since                   B．for                      C．when                     D．while

33．_______ he is young，he knows a lot about the Internet．

    A．Because               B．When                  C．Although                      D．If