We all know trees play an important role in _______up the air.
| A．clean | B．cleaning |
| C．cleaned | D．Cleans |
相关试题
— Give me a call to let me know you got home safely .
— All right ,_____
| A．I will ! | B．I surely do ! | C．Maybe not ! | D．impossibly ! |
— Wow , the opening of Sochi winter Olympics is fantastic !
— It’ s pity ! I _____ for the next monthly exam .
| A．am preparing | B．prepared | C．was preparing | D．will prepare |
You know this term is crucial for all of us . For the _____ of entering a good high school , we do should study all day and all night .
| A．symbol | B．purpose | C．riddle | D．Slogan |
— I’ m new here . I want to go to the second floor to buy some new furniture . Can you do me a favor ?
—Sorry . me too . Let’ s look for the sign _____ together .
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