15.Many students at a middle school in Hanoi, _____ to the hospital with symptoms of poisoning caused by substances in e-cigarettes.
A. were taken B. were taking C. have taken D. are taking
16. The British Council sent an email to IELTS test takers in Vietnam _____ Wednesday night notifying them that their upcoming exams would be postponed.
A. on B. at C. in D. with
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