24．A．and               B．or                 C．but               D．so

23．A．make             B．get              C．use               D．have

22．A．hope              B．want              C．thinks             D．let

21．A．to                B．on                  C．with               D．for

20．What do I have to do ________ I want to be thinner.

     A．until              B．since              C．while            D．if

    Today more and more families have their own computers．Parents buy computers  21  their children．They  22  computers can help them improve their studies in school．However，many of their children  23  computers to play games，to watch videos  24  to sing karaoke instead of（而不是）studying．So many teachers and parents complain（抱怨）that computers call not help children study  25  make them fall behind．So computers are put away  26  parents．

    In  27  countries，even some scientists also  28  computers．They say computers let many people  29  their jobs or  30  them a lot of trouble（麻烦）．

19．I'm happy to know you axe well and in good_______.

     A．health             B．healthy            C．body               D．unhealthy

18．I have some_______ news for you, Tom can't come tomorrow.

     A．disappointed      B．disappointing         C． interested          D．interesting

17．What about ________ more trees to keep the air clean.

     A．to plant             B．plant              C．planting           D．planted

16．Mary _______ on the phone when her friend went into her room.

     A．talked             B．was talking         C．talk                 D．is talking

15．The two women were ______pleased to see each other that they talked on and on happily in the room.

     A．such               B．so                 C．to                 D．very