31.-----hard she tries,she can hardly avoid making mistakes

31._____hard she tries,she can hardly avoid making mistakes in her homework.A.Much B.However C.As D.Although32.Poor _____ it may be,there is no place like home,_____ you may go.A.as; wherever B.though; whenever C.in spite of; when D.that; wherever33.The child was __ immediately after supper.A.enough tired to go to bed B.tootired to go to bedC.so tired that he went to bed D.very tired,he went to bed34.The history of nursing __ the history of man.A.as old as B.is old than C.that is as old as D.is as old as35._____ born in Chicago,the author was famous for his stories about New York.A.Since B.Once C.When D.Although36._____we stood at the top of the building,the people below were hardly visible.A.As B.Although C.Unless D.In spite of37.Scarcely was George Washington in his teens _____ his father died.A.than B.as C.while D.when38._____ David goes,he is welcome.A.Whichever B.However C.Wherever D.Whatever39.The house stood _____ there had been a rock.A.which B.at which C.when D.where40.Small _____ it is,the pen is a most useful tool.A.because B.so C.if D.as