1. Воткните предлоги on, in, into. 1) There are many

Переведем предлоги из задания:

• on - на;
• in - в;
• into - в, внутрь.

1) There are many people in the park today.

2) There is a girl standing on the bridge.

3) There is no tea in my cup.

4) Put these flowers on the windowsill.

5) I saw many people on the platform waiting for the train.

6) We went into the garden and sat down on a bench.

7) The teacher hung a picture on the blackboard.

8) I opened the door and went into the classroom.

9) He put his hands into his pockets. 

10) Put the book into the bag.