20.Bears have been observed __________ by bees.( )
A. | to attack | B. | attacked | C. | attacking | D. | attack |
19.______ with the result of the research,the scientist announced it to the world.( )
A. | Satisfied | B. | Satisfying | C. | Satisfy | D. | To satisfy |
17._______ the gold medal,Laurie told the reporter,"No one will ever know how close I really came to losing in the competition."( )
A. | Awarding | B. | To award | C. | Awarded | D. | Having awarded |
16.The Ice Bucket Challenge is an activity _____ by an American charity organization to make more people aware of the disease ALS.( )
A. | held | B. | holding | C. | having held | D. | to hold |
15.Many Chinese have their houses_____before the Spring Festival.( )
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A. | decorate | B. | to decorate | C. | decorated | D. | decorating |