Hi, wangqh2696122 Acco r ding to the air traffic rules , you ____ switch off your mobile phone before boarding. It has been announced that candidates ____remain in their seats until all the papers have been collected. Use should in both sentences: it indicates what the appropriate [= proper, right] thing to do is in the given circumstances.
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wangqh2696122According to the air traffic rules, you ____ switch off your mobile phone before boarding.Use should in both sentences: it indicates what the appropriate [= proper, right] thing to do is in the given
It has been announced that candidates ____remain in their seats until all the papers have been collected.
wangqh2696122The law of VeniceLegalistic usage includes "shall", so "shall" is fine in that sentence.