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            • 1．

              —_________ we keep the room clean enough all the time?

              —No, you _________.

              A．Must; doesn’t have to
              B．Do; don’t have to
              C．Must; don’t have to
              D．Must; mustn’t
              难度：较难
              解析 收藏 试题篮
            • 2．

              Rubbish ________ everywhere.Itˈs our duty to protect the environment.


              A．throws
              B．canˈt throw
              C．arenˈt thrown
              D．shouldnˈt be thrown
              难度：较难
              解析 收藏 试题篮
            • 3．

              —Be quiet! Mr. Smith is coming.

              —Don't worry. It ________ be him. Mr. Smith is much taller.

              A．mustn't
              B．must
              C．can't
              D．might
              难度：较难
              解析 收藏 试题篮
            • 4．

              Cans, glass bottles and newspapers can be ________ or ________ again.

              A．recycled; use   
              B．recycled; using   
              C．recycled; used   
              D．recycling; used
              难度：较难
              解析 收藏 试题篮
            • 5．
              How kind you are!You always do what you can ______ others．（　　）
              A．help
              B．helping
              C．helps
              D．to help
              难度：较难
              解析 收藏 试题篮
            • 6．
              -Look at the young lady in red．Is it Mrs．King？
              -No，It ________ be her．She is wearing a white dress today．（　　）
              A．can
              B．may
              C．must
              D．can"t
              难度：较难
              解析 收藏 试题篮
            • 7．
              -Could I ride an electric bicycle to school，Mr．Wang？
              -No，you _____．Students under the age of 16aren"t allowed to ride electric bicycles．（　　）
              A．couldn"t
              B．needn"t
              C．can"t
              D．shouldn"t
              难度：较难
              解析 收藏 试题篮
            • 8．

              --- I donˈt care what people think．

              --- Well，you ___．Youˈre not alone in this world．

              A．can                      
              B．may                     
              C．should                 
              D．will
              难度：较难
              解析 收藏 试题篮
            • 9．

              Food safety is important. Rules ________ to protect people from food pollution.

              A．must make
              B．must be made
              C．can"t make
              D．can"t be made
              难度：较难
              解析 收藏 试题篮
            • 10．

              Only in this way __________ protect the environment. So something _______ at once.

              A．we can; must do
              B．can we; must be done
              C．we will; must done
              D．will we; be done
              难度：较难
              解析 收藏 试题篮
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