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

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Grammar and Vocabulary › ViewIf everything goes _______ to plan, we will be able to complete this task by the end of the week.
A. running
B. parting
C. comparing
D. according
Simple and Past Tenses › View
Oxfam ________ in more than 70 countries.
A. works
B. work
C. working
D. worked
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
