[ Vocabulary & Grammar ]
Mr Anderson …….. to reach you for an hour. Where have you been?
A. tries
B. has been trying
C. is trying
D. has tried

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Grammar › View(Its / It’s) not a big deal as long as you don’t do it again.
A. Its
B. It’s
Vocabulary › View
A research method that involves conducting observations and collecting data in a natural setting.
A. field study
B. observation
C. trials
D. experiment