Air pollution, together with littering, has _____ many problems in ...

[ Grammar ]

Air pollution, together with littering, has _____ many problems in our large cities today.

A. caused

B. made

C. affected

D. brought

Select your answer:

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Adverbs of Frequency & Simple Present Tense Participle - ing/ ed Past Continuous Present/Past/Future Continuous Tense Present Tense Complex Sentences Comparative Adverbs Indefinite and Reflexive Pronouns Causative Verb

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Her husband spends a lot of money and she wishes he _____

A. hadn’t

B. wasn’t

C. didn’t

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The first laser ——- in 1960 by Maiman almost half a century after the publication of Einstein’s theory of radiation which ——- the possibility of laser operation.

A. has been demonstrated / had shown

B. had been demonstrated / showed

C. was demonstrated / showed

D. demonstrates / was shown

E. was being demonstrated / shows