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.
单项选择题 More often than not, it is difficult to ______ the exact meaning of a Chinese idiom in English.
