[ Grammar ]
Air pollution, together with littering, has _____ many problems in our large cities today.
A. caused
B. made
C. affected
D. brought

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InfinitiveSimple Tenses in EnglishVerb AbilityCardiology ServicesKinds of NounsPassive Voice - Present TensesSimple TensesGrammar and EssayConditionalsGerund - to InfinitiveOther quiz:
Grammar › ViewThe short story cannot be reprinted _________ explicit permission from the writer.
A. without
B. regarding
C. among
D. unlike
Grammar › View
My parents have visited Paris twice, and they always…..back souvenirs.
A. brought
B. will bring
C. bring
D. had brought
Vocabulary › ViewTo approve and adopt an official document.
A. ratify
B. veto
C. appeal
D. submit
Present Tenses and Vocabulary › View
I’m going to roll up my ………………. and start cleaning the house.
A. sleeves
B. shirts
C. trousers
D. ties
