21. Wild animals have been overhunted, and as ___ result, some of them are among the animals in _____ danger.
A. a; the B. a; 不填 C. the; a D.不填; the
22. During the scientific experiment, Mr. Chen carefully poured the water into the tube, with my classmates _____ beside to see what would happen.
A. were standing B. stood C. standing D. to stand
