[ Grammar ]
It ______ (happen) every year.
A. is happening
B. is happens
C. happens

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Grammar › ViewYou are _____ to do this job.
A. assign
B. assigned
C. assignment
Future Tenses › View
It’s hot in here. ___ I (open) the window?
A. Do I open
B. Am I going to open
C. Am I opening
D. Shall I open?
Vocabulary › Viewsingle source of air pollution
A. point source
B. nonpoint source
C. ozone
D. conservation
Grammar › View
We stopped at the petrol station ……..some water.
A. to buy
B. buying
C. to bought
D. to buying
