21. My boss wants the work —— before long.
A. finish
B. finished
C. finishing
D. finishes
23. Please get ——
A. lose
B. loses
C. lost
D. losing
24. She is —— a song.
A. Sing
B. sang
C. singing
D. been singing
25. They cannot stop.
A. sing
B. sings
C. singing
D. be singing
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