Chatting online can be ________ fun, but kids must be sure they stay safe on ________ web.
A.
/; a
B.
a; the
C.
/; the
D.
a; a
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【简答题】The aim of students who come to school is to study. But to study requires a right way, or you waste either the time or the money. The following are the ways of studying. The best time for reading is m...