【C10】A．whileB．whenC．thatD．which

I doubt____________he will lend you the book.A.whetherB.whenC.thatD.which

【C2】A．whereB．whenC．thatD．which

Air is to men______water is to fish.A．whatB．whenC．thatD．which

【C10】A．whatB．whereC．thatD．which

Animals can move about ____ plants cannot.A: whileB: whenC: becauseD: for

I was watching TV_____ the telephone rang.A. whileB. whenC. since