Which of the following sentences conveys a fact?  
#86769
A
Maryandhersonmustbehomebynow.
B
Carelessreadingmustgivepoorresults.
C
It’sgettinglate,andImustleavenow.
D
Hemustbeworkinglateattheoffice.
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---Did you get a ticket? ---Yes. Otherwise I____ the concert last night.
#87099
A
didn’t attend
B
wouldn’t attend
C
hadn’t attended
D
couldn’t have attended
Students urged that the school library ______open during the long vacation.
#87054
A
be kept
B
kept
C
must keep
D
must be kept