[ Vocabulary ]
Pollution can have serious effects_________ the balance of ecosystem.
A. in
B. on
C. to
D. for
Select your answer:
Random Topics:
Modal Verbs and PermissionSentence StructureCommon ErrorTypes of SentencesVocabulary and GrammarAdverbial Clause of Cause and EffectPresent Simple and Continuous TenseRelative Clauses and Past PerfectTenses, Tag Questions, Phrasal VerbsSentence Fragments and Complete SentencesOther quiz:
Tenses › ViewThe crowd cheered after the footballer ______ a goal.
A. had scored
B. scored
C. was scoring
D. was scored
Mixed General Quiz › View
São Paulo ___ by Jesuits in 1554.
a. was founded
b. founded
c. has been founded
d. was found