96.Many difficulties have ______ as a result of the changeover to a new type of fuel.
    A. risen         B. arisen         C. raised       D. arose
97.We waited and waited. ______we had been looking forward to .
A. Then came the hour            B. Then did the hour come
C. Then the hour came            D. The hour then came
98. In a sports team each player has a clear role, and there are few occasions _______ members are confused or uncertain of their roles.   A. which    B. when      C. that      D. how
99. what if we meet with a situation ___________ none of us are able to deal with?
A. where      B. in which       C. what      D. that
100. You can hardly imagine the great trouble I took ____________ your house.