Which of the following signs means “You can’t take photos here.”
—______ Monday we have a basketball game. — Is it _______ the morning?
—Where are the books? —_______ in the bookcase. Do you need _______ now?
—Is the blue ruler _______? —No. _______ ruler is red.
This morning I have _______ art lesson. Art is _______ useful subject.
It is __________ difficult work __________ nobody can do it well．
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