We must not __________ the river by dumping dirty dishwater ...

[ Vocabulary and Grammar ]

We must not __________ the river by dumping dirty dishwater into it.

A. polluted

B. pollute

C. pollutes

D. polluting

Select your answer:

Random Topics:
Grammar - First Conditional Gerund, Infinitive & Modals Phrasal Verb Verb Tenses Grammar - Connectors Past Modals Simple Past - Irregular Verbs Comparative and Superlative Adjectives Conjunctions & Cohesive Devices

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