61. The plane crashed killing all 157 passengers ________ (在飞机上).
20. If it ______ for the snow, we ______ the mountain yesterday.
A. were not; could have climbed B. were not; could climb
C. had not been; could have climbed D. had not been; could climb
19. --- How are Jim and Cathy doing?
--- _______ I know, they are doing fine.
A. As well as B. As soon as C. As long as D. As far as
18. The boy is _____ to make a great difference in the future, because he is so bright.
Besides, he works extremely hard.
A. likely B. possibly C. probably D. perhaps