43. A. if or not B. however C. whether or not D. whenever
42. A. placed B. laid C. fixed D. born
41. A. slower B. more C. fewer D. less
40. A. one B. the other C. another D. one of the
39. A. high B. low C. little D. small
38. A. an B. not C. no D. without
37. A. Yes B. No C. Right D. Wrong
36. A. Frankly B. Generally C. Unfortunately D. Strangely
34. Not until the early 19th century _____ what heat is.
A. did man know B. man began to know
C. man did know D. didn’t man know
