Mark the only option in which the word(s) in bold type expresses an idea of obligation/necessity:
"… the constant increase in air traffic can be accommodated …" (lines 11-12).
"…solutions must be found elsewhere, and with the relevant parties." (lines 33-34)
"Some elements of airport operations may be under the control of the State, ..." (lines 37-38).
"EUROCONTROL is going to help them to do this, ..." (lines 49-50).
"The 'Airports' pages of the EUROCONTROL website will give you…" (lines 51-52).
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