Ответ:

2.Here are the papers that you haven't looked through yet

3.David E. Hughes who was a British scientist transmitted radio signals in 1879.

4. What is the name of that boy book whose you borrowed?

5. What is the name of the river which goes through the town?

6. Look at the old man is standing near the window. Do you recognize who is him?

7. There is a man here that repairs mobile phones.