Parts of the cave have been badly affected by rain and           to the air.

He often asks his neighbour to look after his pet during his _______.

The purpose of the campaign is to raise the public’s_______ of the dangers of passive smoking.

This book gives a brief _____ of the history of the castle and details of the art collection in the main hall.

The system has been designed to give students quick and easy _________ to the digital resources of the library.