题目内容

The expense is _______ reduced.

A. enormous
B. enormously
C. large
D. enlarge

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

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

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