Put in prepositions:on,in или into.
1.We went ... the garden and sat down ... a bench.
2. the teacher hung a picture ... the blackboard.
3. I opened the door and went ... the classroom.
4. The teacher was writing some words ..the blackboard.
5. The pupils were writingthese words ...their exercise-books.
6.There were some books and pens ...the teacher"s table.
7.there were two maps ... the wall and some flowers ... the window-sills.
8.I saw a pen ... the floor.
9. I picked it up and put it ... the table.
10 He put his hand ... his pocket.took out a latter and dropped it ...the mail-box which hung ... the wall of the house. 
11.Then he got ...his car and drove off.