The problem ________ when the students refused to do their homework.
A、aroseA
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It'smore________tobuyaseasonticketifyoutraveleveryday.
Theaddressbook________theemailaddressesofyourfriendsorgroupsofcolleagues.
Each year in the United States, many black teenagers _______ of school, either because they cannot keep up or they have to work to support their family.
WeweretoldthatSuewouldbeidealforthejob,butshe________badlywhenwetalkedtoher.
________tothepapersisrestrictedtoDefenseDepartmentpersonnelonly.
