Ответ :

2.flying

3.swiming

4.siting

5.watching

6.useing

7.hiting

8.takeing

9.makeing

10.puting

11.walking

12.comeing

Объяснение:

нужно просто прибавлять ing ко всем словам

fly-flying, swim-swimming, sit-sitting, watch-watching, use-using, hit-hitting, take-taking, make-making, put-putting, walk-walking, come-coming.