[ Mixed Tenses ]
While I _______ at the bus stop, three buses went by in the opposite direction.
A. was waiting
B. waited
C. had waited

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Reported Speech and Tenses › ViewChoose Modal Verb indicating possibility: It ____ rain tomorrow.
A. may
B. mustn’t
C. shouldn’t
Modal Verbs › View
You ____ call a doctor if the symptoms persist.
A. should
B. can
C. may