Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

She stood there,______ over whether or not to tell him the truth.

A. The possibility of changing the Martian environment

B. The challenge of interplanetary travel

C. The advantages of establishing colonies on Mars

D. The need to study Martian ecology

B. lacks

C. hopes

D. neglects

A. The work I do is harder, so I get better grades.

B. I work harder than before even if I get better grades.

C. The harder I work, the better grades I get.

D. The work I do is better, so I work harder.

A. appealing

B. committed

C. specialized

D. admitted

A. has read / make

B. was reading/made

C. had read/made

D. read / had made

A. humanity

B. civilization

C. constitution

D. philosophy

A. hadn't received / moved

B. don't receive / had moved

C. didn't receive / have moved

D. haven't received/moved