As a courtesy to other audience members, please refrain from ...

★ Sentence Completion

As a courtesy to other audience members, please refrain from —– your mobile phone once the performance has started.

A. use

B. used

C. using

D. to use

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Please arrive fifteen minutes before the start of the workshop —– you will have time to register.

A. which

B. however

C. because of

D. so that