Put the verbs in brackets into the correct form

Put the verbs in brackets into the correct form. (1 pt)

17. Due to the.....development in the science and technology, impossible things have become possible. (develop)

18. The.....chemical waste is dumped into the river.(poison)

19. Can you tell me who's the telephone's..............?(invent)

20. We must learn about keeping the environment……(pollute)