Fill in the blanks with "am","is","are","was" or "were".
1.It is Monday today.Anna and Mary are at work.It was Sunday yesterday and they were at home.
2.It__midnight.The children__in bed.They__in the livling-room three hours ago.
3.It__12 noon and she__in the kitchen.She__in the garden two hours ago.
4.It__Saturday today.The girls__at their grandmother,s. They__at the zoo last Saturday.
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