11.One of the properties of light is ______ traveling in wave form as it goes from one place to another.
a.itb. it’sc. its d. their
12.______ in the world has been asked to do his duty for the human society.
a.Each of the trampsb. Every of the trampsc. The each trampd. The every tramp
13.In some restaurants, food and service are worse than ______ used to be.
a.theyb. itc. themd. that
14.Let the porter take all the baggage out and put ______ in the lobby.
a.itb. theyc. themd. its
15.Everyone who comes to the party is given a wooden apple with _____ own names cut in it as a souvenir.
a.hisb. herc. theird. our
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