[ Tenses ]
Susan is busy. She ___ on the phone.
A. was talking
B. is talking
C. talks

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A. article
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Must or Mus not › View
We ______ arrive at school on time.
A. must
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Verbs and Prepositions › View
Which preposition correctly completes the sentence: “She worries _ her future.”
A. about
B. with
C. on
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