[ Vocabulary ]
What is the meaning of the word “ambiguous”?
A. Clear
B. Uncertain
C. Definite
D. Obvious
Select your answer:
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Grammar › ViewThey ______________________ (not play) football yesterday afternoon.
A. was playing
B. were not playing
C. were not
Word Form & Verb Tense › View
People can develop health problems and become ill if they breathe _____ air
A. pollution
B. to pollute
C. polluting
D. polluted