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Verbs coming from nouns and adjectives

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English exercise "Verbs coming from nouns and adjectives" created by costo with The test builder. [More lessons & exercises from costo]
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1. The technology simplessimpliessimplifiesI don't know (simple) human condition nowadays.

2. We use a few products to purifypurespurifiesI don't know (pure) water.

3. The Moon sometimes yellowiesyellowsyelloesI don't know (yellow) according to the pollution or the position of the Sun.

4. The law equalizeequalyzesequalisesI don't know (equal) boys as girls through the same rights and duties.

5. Hardworking richiesenrichesenrichiesI don't know (rich) its subject, tell wises.

6. He can strengthenstrongersstrongiesI don't know (strong) himself only by exercising hardly.

7. Smoking is dangerous, it blackingsblackensblacklistsI don't know (black) the lungs.

8. The excessive use of chemical fertilisers poverisesimpoverishespoversI don't know (poor) soils.

9. Better data programmers assocyassociateassociesI don't know (association) themselves to produce a powerful software.

10. The government would like people to planteplantplantyI don't know (plantation) trees in this park.

11. The soil always fodsfeedsfoodI don't know (food) the true farmer.