[ Grammar ]
The atmosphere is getting more………because there is more smoke from factories and motor engines.
A. polllute
B. polluting
C. polluted
D. pollution

Random Topics:
Grammar - either...or, neither...norPassivisationRelative Pronouns and AdverbsPerfect TensesComparativesComparatives and Past Perfect TenseGerunds and InfinitivesGrammar & TensesModals of ObligationVerb + Infinitive or GerundOther quiz:
Phrasal Verbs › ViewRemember to ________ your assignment next class.
A. hand in
B. bring up
C. do up
D. take in
Grammar › View
Do you think these books _______ more expensive next week?
A. will be
B. are being
C. was
Tenses › ViewJogging is a very good exercise.
A. Present Simple Tense
B. Present Continuous Tense
C. Simple Past Tense
D. Past Continuous Tense
Vocabulary › View
Horrible; shocking
A. Ghastly
B. Petulance
C. Verandah
D. Accomplice