31._____hard she tries,she can hardly avoid making mistakes in her homework.

31._____hard she tries,she can hardly avoid making mistakes in her homework.
A.Much B.However C.As D.Although
32.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; wherever
33.The child was __ immediately after supper.
A.enough tired to go to bed B.tootired to go to bed
C.so tired that he went to bed D.very tired,he went to bed
34.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 as
35._____ born in Chicago,the author was famous for his stories about New York.
A.Since B.Once C.When D.Although
36._____we stood at the top of the building,the people below were hardly visible.
A.As B.Although C.Unless D.In spite of
37.Scarcely was George Washington in his teens _____ his father died.
A.than B.as C.while D.when
38._____ David goes,he is welcome.
A.Whichever B.However C.Wherever D.Whatever
39.The house stood _____ there had been a rock.
A.which B.at which C.when D.where
40.Small _____ it is,the pen is a most useful tool.
A.because B.so C.if D.as