1.The woods and the newlydug river through the campus（校园） the beauty of this
worldknown university.
A. add up B. are added to C. are added up D . add to
2.Why don’t you ________ your ideas on paper?
A. set about B. set out C. set down D. set up
3. Don't waste lots of time looking for the answer to one question. Leave it and come back to it later .
A. if you are necessary B. if necessary C. if is necessary D. if it necessary
