Ответ:

1)Who has already bought a ticket....

I've already bought.

2) Who did buy the tickets...

They did.

3)Who are going to buy...

We're going.

4)Who has always wanted to....

They've always wanted.

5)Who has worked hard...

They've worked.

6)Who did work hard last month.

They did.

7)Who was interested in Geography

They were.

Объяснение: