1.Our Chinese teacher is 66.Oh ,no .She ______over 60,i think .

1.Our Chinese teacher is 66.Oh ,no .She ______over 60,i think .
A.can't be B.shouldn't be
为什么不选B,表示“按常理超过60岁”?
2.They hurried so that they _____ not miss the bus .
A.might B.should
为什么不选B,表示“按常理不会错过公交”
3.--This ___be Bill's house .It's NO.101
--Oh ,i don't think so .he said his house was a blue one
,but is one is yellow .
A.can B.must
为什么不选A,表示理论上是Bill的家?
4.Will you come to my birthday party
No ,I_______
A.won't B.can't
为什么不选A?
5.where is my pen I______it .
A.might lose B.must have lost
为什么不是A,表示“我可能丢了”?
6.Mary is not in her bedroom .She_____in her classroom .
A.should have been B.must have been
为什么不选A,表示“（过去）按常理在她的教室”?
7."We didn't meet him at the party yesterday" ."He_______it "
A.can't have visited B .should have gone to see .