题目内容

The tubes could go alongside roads _______ there is adequate space.

A. that
B. which
C. when
D. where

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The cost of setting up the system could _______ below $2.5 million per kilometre.

A. keep
B. be kept
C. keeping
D. kept

In this way, the cost could be reduced. That is a _______ to a tenth of the cost of building a railway.

A. five
B. fiveth
C. fifth
D. fives

Whether that is cheap enough for the system to be practical _______ to be seen.

A. remain
B. remains
C. remaining
D. to remain

Perugia is an old city _______ narrow, steep streets do not make existing methods efficient.

A. which
B. that
C. whose
D. who