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Mr Black has two cats.One is big and the other is small.He likes them very much.One day his good friend Mr Green comes to see him.He is very surprised.He finds two holes(洞）in the door, a big hole and a small one.He says, “My dear friends, why are there two holes in the door?” “To let them in and out.” Mr Black answers.“But why are there two holes?” asks his friends.“How can the big cat go through the small hole?”
（1）Mr Black has _____________.
A.two small cats  B.two big cats  C.a big cat and a small one
（2）Mr Green comes to see _____________.
A.Mr Black      B.Mrs Black       C.The cats
（3）Mr Black wants _______ to go through the two holes.
A.the big cat      B.the small cat     C.two cats
（4）Mr Black thinks the big hole is only for ________.
A.the small cat     B.the big cat      C.the two cats
（5）______ is not necessary(必要的).
A.The big hole     B.The small hole   C.The big door