Spectators in the crowd watched in horror as the plane ________________.

One of the climbers killed by  _________________ in Scotland at the weekend was a member of the mountain rescue team that recovered his body.

I'll ask my personal assistant to __________ our conference preparations.

Fully half of the human population today live in areas with _______________.

All countries are being asked to _________ their use of non-renewable resources .

The law requires a detailed analysis of the potential __________ on the environment of a proposed project.

If I ___________________ after an earthquake, what should I do while waiting for help?

Pollution occurs when ecosystems can not _________ of substances introduced into the environment.

A highly respected British diver has died during the exploration of _______________ off the coast of Greece.

We were having a conversation when he came up and ________________.