Which sentence contains an intransitive verb?
a. ian sharpened his hockey skates.
b. carla skates before school in the morning.
c. our hockey team won the league championship.
d. jenna chose hector as her skating partner.

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.