谁能帮我做一下这些定语从句?

谁能帮我做一下这些定语从句?
31.That was the reason___Mac refused to speak at the meeting.
A.why B.that C.which D.of which
32.Do you know the reason___he was late for school?
A.of it B.for it C.which D.for which
33.That was the reason___Mac refused to speak for at the meeting.
A.why B.that C.for that D.for which
34.That was the reason___Mac gave me the other day.
A.why B.for that C.which D.for which
35.The picture ___ has mountains and rivers is the one I like best.
A.which B.whose C.what D.where
36.Please bring back the dictionary____I lent to you last week.
A.where B.what C.which D.who
37.The knife___we cut the bread is very sharp.
A.with which B.that which C.which with D.which
38.Mother bought me a dictionary on my birthday,____made me very happy.
A.which B.that C.whose D.which
39.His dog,___was now very old,became ill and died.
A.it B.that C.whose D.which
40.I saw some trees,the leaves of ___were black with disease.
A.that B.which C.whose D.the trees
41.You must watch carefully everything____the teacher does in class.
A.where B.that C.who D.what
42.He told me all____he knew.
A.which B.what C.that D.who
43.This is one of the most exciting football games____I have ever seen.
A.that B.which C.what D.whom
44.The last place ____we visited in the countryside was a farm.
A.that B.which C.where D.in which
45.The first English novel ____I read was Robinson Crusoe.
A.which B.that C.where D.who
46.You can never imagine what great trouble I have had ____ the patient who received a serious wound.
A.treat B.to treat C.treating D.treated
47.When he came back from abroad,John told his parents about the cities and the people___he had vsited.
A.who B.which C.where D.that
48.Is there any question____troubles you much?
A.which B.where C.who D.that
49.Who is the man____is speaking there?
A.whom B.which C,that D.whose
50.She is the only person ___understands me.
A.whom B.what C.whose D.that

31.A 32,D 33,B 34.C 35,A 36,C 37.A 38.B 39.D 40.B 41.B 42.C 43.A 44.A 45.B 46.C 47.D 48.D 49.C 50 D.