50.( ) A. important B. necessary C. easy D. difficult
49.( ) A. regard B. consider C. act D. keep
48.( ) A. reason B. thing C. cause D. why
47.( ) A. noises B. voices C. sounds D. words
46.( ) A. so B. but C. or D. although
45.( ) A. uncovered B. found C. discovered D. founded
44.( ) A. safe B. danger C. silent D. calm
43.( ) A. laughing B. playing C. asleep D. crying
42.( ) A. beat B. whipped C. killed D. buried
41.( ) A. in order B. in disorder C. out of order D. with order