完型填空一题There was a woman in Detroit,who had two sons.She was

完型填空一题
There was a woman in Detroit,who had two sons.She was worried about them,especially the younger one,Ben,(66) he was not doing well in school.Boys in his class made jokes about him because he seemed so(67).
The mother (68) that she would,herself,have to get her sons to do better in school.She told them to go to the Detroit Public Library to read a (69) a week and do a report about it for her.
One day,in Ben's (70),the teacher held up a rock and asked if anyone knew it.Ben put up his hand and the teacher let him(71)."Why did Ben raise his hand " they wondered.He (72) said anything; what could he possibly want to say
Well,Ben not only (73) the rock; he said a lot about it.He named other rocks in its group and even knew (74) the teacher had found it.The teacher and the students were (75).Ben had learned all this from doing one of his book (76).
Ben later went on to the (77) of his class.When he finished high school,he went to Yale University and at last became one of the best doctors in the United States.
After Ben had grown up,he (78) something about his mother that he did not know as a (79).
She,herself,had never learned how to (80).
66.A.because B.so C.but D.though
67.A.clever B.hard C.slow D.quick
68.A.asked B.decided C.forgot D.heard
69.A.notice B.message C.book D.question
70.A.class B.room C.office D.lab
71.A.think B.leave C.stand D.speak
72.A.always B.even C.quickly D.never
73.A.found B.played C.knew D.threw
74.A.whether B.when C.where D.why
75.A.afraid B.surprised C.worried D.unhappy
76.A.pictures B.exercises G.shops D.reports
77.A.top B.end C.back D.side
78.A.learnt B.remembered C.understood .D.guessed
79.A.doctor B.child C.student D.teacher
80.A.read B.work C.teach D.show
(66.A 67.C 68.B 69.C 70.A 71.D 72.D 72.C 74.C 75.B 76.D 77.A 78.A 79.B 80.A)