Fill in the correct word(s) from the list below.
Use the word(s) only once.
a study, fragile, low, long-term, to disturb, above,
to mark, expands, to raise, high speed, financial,
regulations
1.......... railways
2........... the countryside
3.............. gain
4............. fuel bills
5... a question
6............ environment
7 the population ...
8............ impact
9............. ground
10........... to be imposed
11............ carried out by
12.... the position
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