[ Grammar ]
We usually __________ our grandparents at weekends, but this weekend we __________ at home.
A. visit / stay
B. visits / are staying
C. visit / are staying
D. visited / stay

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You’d better _______ a commitment to being a volunteer on a regular basis.
A. promise
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She ______ there for over five years.
A. haven’t been
B. gone
C. hasn’t been
