Which of the following sentences uses "crash" as a verb?
a. the cyclists will probably crash on that last curve.
b. fortunately, the crash was not as bad as it could have been.
c. the cyclist avoided the crash by an inch.
d. crashing his unicycle is colin's worst fear.

Aman lives on the twelfth floor of an apartment building. every morning he takes the elevator down to the lobby and leaves the building. in the evening, he gets into the elevator, and, if there is someone else in the elevator -- or if it was raining that day -- he goes back to his floor directly. otherwise, he goes to the tenth floor and walks up two flights of stairs to his apartment.