________ was the center of our planetary system was difficult concept to grasp in the Middle Ages.
A. It was the sun and not the earth
Being the sun and not the earth
C. That the sun and not the earth
D. The sun and not the earth
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Shall we request the committee ________ our suggestion again?
A. to consider
B. consider
C. considering
D. considered
________ three whole years working on the design of the equipment.
A. It took the chief engineer
B. The chief engineer spent
C. The chief engineer took
D. It cost the chief engineer
Did you ask the teacher ________ the day before?
A. what was happened to her
B. what she had happened
C. what she happened
D. what had happened to her
Jane has ________ uncle and he is now staying in ________ European country.
A. an; an
B. an; the
C. an; a
D. a; the
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