12.Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. Do you know the reason _______

12.Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
Do you know the reason ___________humans are interested in Mars and other planets in the solar system?
A.
that
B.
why
C.
whose
D.
which
13
Mark letter A, B, C or D on your answer sheet to indicate the sentence that is closest in meaning to the original sentence in each of the following questions.

This is the first time I have seen a spacecraft.
A.
I never see a spacecraft before.
B.
I have seen a spacecraft before.
C.
I have ever seen a spacecraft before.
D.
I have never seen a spacecraft before.