1) I can't concentrate if you talk________ I'm trying to study. a) during b) for c) while 2) You can't take pictures______ the ceremony. a) during b) for c) while 3) I couldn't sleep________ two days. a) during b) for c) while 4) We've (have) known each other________ a couple of years. a) during b) for c) while 5) Did anybody call__________  I was away? a) during b) for c) while 6) She talked to a friend _________a test . a) during b) for c) while

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