完形填空,Please look 1_________ the picture.The is a 2_________

完形填空,
Please look 1_________ the picture.The is a 2_________ of a classroom.In the picture you can see 3_________ desk and chairs.On the blackboard,you can see a cat.A map is 4_________ the door.The room is differend（不同） from 5_________ classroom.Under the 6_________desk,there's a ball,7_________ you can't see it.The boy 8_________ the hat is my friend-Jim.He's a new student.He's American.He looks 9_________ Sam.But they are not 10_________.
( )1.A.in B.on C.at D.to
( )2.A.map B.picture C.room D.door
( )3.A.the B.a C.some D.any
( )4.A.behind B.in C.at D.of
( )5.A.my B.me C.I D.of
( )6.A.teacher's B.teaches' C.of teacher D.teasher
( )7.A.so B.or C.and D.but
( )8.A.on B.under C.in D.of
( )9.A.after B.the same C.for D.like
( )10.A.studer B.girls C.boys C.twins
blackboard是什么意思?