[ 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

Random Topics:
TOEIC Tenses, VerbsCountable Vs Uncountable NounsGrammar: Simple Past and Past ContinuousPast Continues TenseGrammar SuffixesPresent Simple VS ContinuousHow much and how manyModals and Past ModalsBare Infinitive and To InfinitiveGrammar: Reported QuestionsOther quiz:
Homonyms › ViewPlants benefit from a daily spray of ___.
a. missed
b. mist
Zero Conditional › View
What ________________ you do in my situation? I need your advice.
A. can
B. should
C. have to
