Grammar Quiz
[ Vocabulary ]

Carbon dioxide and black carbon, or ______, are two of the most dangerous air pollutants.

A. soot

B. mould

C. mildew

D. asthma

Select your answer:
A  B  C  D  E 


Random Topics:

BASIC GRAMMAR - PRONOUNSDemonstrative Pronouns and Verb TensesModal PerfectFirst ConditionalsPast Continuous and Past Simple TenseDemonstrative PronounsPast ParticiplePassive Modals in Different TensesBasic TensesIN, ON & AT

Other quiz:

Grammar › View

Some people try to learn new words and phrases ______ heart.

A. with

B. in

C. by

D. from

Grammar › View

Ivan doesn’t like milk, ______ he?

A. Does

B. Doesn’t

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