The hunter calmly picked up his gun,took the aim and fired, ______ the beast．

       A．bringing down                                    B．pulling down     

       C．falling dowing                                    D．putting down

 —Have you been wasting time on computer games again?

       —______．I’ve been studying a lot and I need a break．

     A．No way                                          B．Not really       

       C．I don’t agree                                    D．I couldn’t agree more

 ______ worries me the way he keeps changing his mind．

     A．This              B．That               C．What              D．It

 ______ I really don’t like art, I find his work impressive．

     A．As               B．Since              C．If                 D．while

 —Where did you get to know her?

       —It was on the farm ______ we worked．

     A．there              B．that                C．where             D．there

 The country has already sent up three unmanned spacecraft, the most recent ______ at the end of last March．．

     A．has been launched                        B．having been launched

     C．being launched                           D．to be launched

 —Is there anything wrong , Bob? You look sad．

       —Oh, nothing much．In fact, I ______ of my friends back home．

     A．have just thought                          B．was just thinking

     C．would just think                          D．will just be thinking

 By the time he realizes he ______ into a trap, it’ll be too late for him to do anything about it．

     A．walks              B．walked            C．has walked     D．had walked

 ______ you eat the correct foods ______ be able to kiip fit and stay healthy．

     A．Only if; you will                           B．unless; you will

     C．Only if; will you                           D．unless; will you

 It looks like the weather is changing for ______ ．Shall we stick to our plan?

     A．the worse         B．worse             C．the worst        D．worst