What’s the matter with John? He has been sitting there for hours．—A postcard from his fatheran attack of home – sickness in him．

______ good advice he gave us!

You’d better put things back.Otherwise, it will be difficult to find things.[ ]

Foreign teachers would like students to ________ ask questions, submit theories, or to debate any required reading materials [ ]

_______ of the materials I listened to at the beginningof the exam _______ easy.