51By the time the police arrived, the thief ___ already escaped.
52She ___ left the office before I reached there.
53He ___ studying for two hours before I arrived.
54They ___ playing since morning before it started raining.
55I ___ call you tomorrow morning.
56She ___ visit her grandmother next week.
57We ___ meet you at the airport tomorrow.
58They ___ arrive by evening.
59He ___ join us for dinner tonight.
60I am sure it ___ rain tomorrow.
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