7.____ such heavy pollution already,it may now be too late to clean up the lake.( )
A. | Suffering | B. | Having suffered | C. | To suffer | D. | Suffered |
6._____ all my old friends,I felt shy and lonely at my new school.( )
A. | Lost | B. | Being lost | C. | Losing | D. | Having lost |
5._____ the cry for help,people immediately rushed out of the rooms.( )
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A. | To hear | B. | Hearing | C. | Having heard | D. | They hearing |