Grammar Quiz
[ Vocabulary ]

Pollution can have serious effects_________ the balance of ecosystem.

A. in

B. on

C. to

D. for

Select your answer:
         


Random Topics:

Grammar & VocabularyModal Verbs of PermissionBare Infinitive and To InfinitiveNoun, Verb, AdjectiveParts of SpeechPast Simple VerbsArticles - rulesGrammar and Passive VoiceSimple Past - Irregular Verbs

Other quiz:

Sentence Structure › View

She studied hard for the exam.

A. Simple

B. Compound

C. Complex

D. Compound-complex

Prepositions › View

Choose the right preposition: He is good ____ singing.

A. on

B. by

C. at

D. in

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