21.   Bear in mind that background material expands infinitely, and needs to be closed off somewhere to prevent you becoming submerged in an endless and unfinishable project.

22.   In their dispute with Iran the British set out to close off all outlets for Iranian oil.

23.   Institutions such as insurance companies which had bought Forestry Commission land had closed off woods to the public.

24.   To protect the scene, the park was closed off to the public for much of the day but has since been re-opened.

25.   The northbound carriageway between junction ten at Ardley and junction eleven at Banbury was closed off... traffic queues stretched back ten miles.

26.   The fire brigade closed off the whole road while they dealt with the fire.

27.   In another fire, this time in Gloucester, streets were closed off when fire broke out in a storeroom of the old Co-op building.

28.   The road could be closed off and the beach opened up and made more accessible.

29.   Police closed off the westbound carriageway for an hour.

30.   Your last option, if everything is closed off, is knock it on the top and try and lead into chase.