Whether that is cheap enough for the system to be practical _______ to be seen.
A. remain
B. remains
C. remaining
D. to remain
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Perugia is an old city _______ narrow, steep streets do not make existing methods efficient.
A. which
B. that
C. whose
D. who
This study suggested that the system _______ the cost of building it within seven years.
A. would repay
B. repays
C. repay
D. repaying
China might benefit _______ this new system.
A. to
B. for
C. with
D. from
His team is now working with researchers at Tongji University in China who are _______ tying Pipenet there.
A. interesting with
B. interesting in
C. interested with
D. interested in