单项选择题
Contrary ______ public opinion, this area has long been a heaven for all forms of insect life.
单项选择题 Your advice would be ______ valuable to him, who is now at a loss to what to do first.
单项选择题 The teacher told his pupils to ______ their work.
单项选择题 This new process, which is easily learned and operated, should be particularly ______ to companies once put into effect.
