1. For the control of the deadly brain disease in cows (BSE), surveillance is being stepped up in Canada, but the US claims to be testing enough cattle already to ---- the risk.

2. In an aircraft, the cabin lights are dimmed during take-off and landing to help passengers to ---- themselves to darkness in the event of an emergency.

3. A fair proportion of the workforce now work from their homes, a ---- that has been made possible by computers.

4. North Korea is ---- to abandon its nuclear programme without specific security guarantees from America and promises of lots of aid.

5. Pharmaceutical firms are wary of devoting money to new antibiotics whose sales can be ---- limited by the development of resistance in the target microbes.