You have to leave them blank. Whether it's a trick is up to you and your teacher to discuss!
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AnonymousFor my English class, I have to fil the blank with either IN, ON or AT
__________ yersterday morning
____________tomorrow night
I have no problems with those prepositions but it confuses me when the teacher gives us excercises that include the words yesterda/today/tomorrow...
Is is "ON tomorrow night" ? it doesn't sound right