Put the words in the correct order to make full sentences.

Write one word in each gap.

plants / this / these / substance / absorb / can?

[ ] [ ] [ ] [ ] [ ] [ ]?

air / the / emit / substances / in / harmful / factories.

[ ] [ ] [ ] [ ] [ ] [ ] [ ].
a / I / new / to / eco-project / want / in / involved / be.

[ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ].

reaction / called / is / how / this?

[ ] [ ] [ ] [ ] [ ]?