[ Grammar ]
School students ________ wear uniform to school.
A. should
B. must
C. need to
D. must not

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Grammar › ViewWhat is the simple past tense of the verb ‘go’?
A. going
B. went
C. gone
D. goes
Grammar › View
I have turned in the essay that I had spent several weeks working on.
A. NO CHANGE
B. I have turned in the essay that I have spent several weeks working on.
C. I had turned in the essay that I have spent several weeks working on.
D. I turned in the essay that I will have spent several weeks working on.
Grammar › ViewWhich modal expresses moral duty?
A. Ought to
B. Should
Grammar › View
What are ______ surnames?
A. they
B. their
C. theirs