[ Grammar ]
We ………. our grandparents this weekend.
A. Visit
B. Are visiting
C. Visiting
D. Visits

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A. go
B. has gone
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Choose the correct sentence about a ship’s routine:
A. The crew work hard everyday
B. The crew works hard everyday
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Sarah Frances Whiting opened the —- of physics in the United States in 1878.
A. undergraduate teaching was in a second laboratory
B. second teaching laboratory of undergraduate
C. undergraduate teaching laboratory was second
D. second undergraduate teaching laboratory