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            • 1． Over the years，while focusing on its own development，China _____ aid to the best of its ability to other developing countries with various difficulties．（　　）
              A．provides
              B．is providing
              C．has been providing
              D．will provide
              难度：难
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            • 2． _____in the queue for half an hour，the old man suddenly realized he had left the money in the car．（　　）
              A．Waiting
              B．Having waited
              C．To wait
              D．To have waited
              难度：中等
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            • 3． --I’m sure Andrew will win the first prize in the final.

                  --I think so. He __________ for it for months.

               

              A．is preparing
              B．was preparing
              C．had been preparing
              D．has been preparing
              难度：较易
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            • 4． Mary is taking good care of the old patient in the hospital where she______for ten years.
              　A. had worked　B. works
              　C. is working　D. has been working
              难度：中等
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            • 5． The little boy is dirty from head to foot because he __________in the mud all morning.
              A．has played   
              B．is playing   
              C．has been playing   
              D．was playing
              难度：中等
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            • 6． In the past decades, sea ice ____ in the Arctic as a result of global warming.
              A．had melted                                                                 
              B．has been melting       
              C．melted                                                                          
              D．is melting
              难度：中等
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            • 7． — That’s the third time he’s won the award in this field.
                  — Yes. He ________ his maximum potential in the past decade.
              A．explored                                           
              B．is exploring         
              C．has been exploring                          
              D．has explored
              难度：中等
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            • 8． —How long ___ like this?
                       —Three weeks! It's usual here that rain ___ without stopping these days of the year．
                       A．has it rained; pours                         B．is it raining; is pouring
                       C．has it been raining; pours                       D．does it rain; pours
              难度：中等
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            • 9． I __________ glasses since I was in primary school and I hate them. They make me look like a bookworm.
              A．have worn     
              B．have been wearing  
              C．have been worn   
              D．was wearing
              难度：中等
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            • 10． — What’s the price of petrol these days ?
                 — It _______ frequently since last year .
                 A. is arisen     B.  increased    C. has been rising   D. has raised    (原创)
              难度：中等
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