[ Tenses ]
The air in some big cities ____________________ more polluted
A. is becoming
B. becomes
C. will become
D. became

Random Topics:
First ConditionalFamily Members and Present SimpleVerb + InfinitiveVerb Tenses and UsageGrammar and PrepositionsCoordinating ConjunctionVerb and PrepositionModals and Active and Passive VoiceQuantifiers and ArticlesDefinite and Indefinite ArticlesOther quiz:
Vocabulary › View_____ are hints that help solve a problem or mystery.
A. landmark
B. grand
C. clues
D. carve
How often - long - much - many › View
How _____ does your father smoke?
A: About two cigarettes a day.
A. much
B. many
C. long
D. often
Grammar - Place and Movement › ViewAnother word that means the same as ‘next to’ is ….
A. over
B. through
C. beside
Grammar and Vocabulary › View
Bill is going to …… his son from school and take him to basketball practice.
A. drop off
B. pick up
C. set up
D. point out