Example sentences of "must be [vb pp] [adv] at [art] " in BNC.

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1 Food production must be increased even at the risk of damaging the environment
2 All mortgages by companies of registered land must be registered both at the Companies ' Registry and the Land Registry .
3 For proper ventilation , cool air must be drawn in at the base to replace the hot air that has been extracted .
4 The car is collected on arrival at the overseas airport , and must be returned there at the end of your holiday .
5 As far as the Channel Tunnel is concerned it has reluctantly accepted the need for on-train immigration checks but is still insisting that customs checks must be carried out at the terminals , against the advice of commercial interests who see such checks as detrimental to the ‘ user friendliness ’ of the Tunnel .
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