[ Grammar ]
We _____ from the other group for over an hour. We are worried.
A. did not hear
B. are not hearing
C. do not hear
D. have not heard

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A. Whereas
B. While
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______ swim here or you ______ be in danger.
A. Must / can
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The problem is I will ……..another day to revise grammar.
A. needs
B. to need
C. need