---What _____ useful book! And ______ book is popular with students.A. a, a B. a, the C. the , the
is the largest freshwater lake in China.
is the Chinese tradional holiday.
The teacher slapped .
—Must I come back before supper, mum? —No, you .
—When did you buy this computer? It looks so new. —I it for only a couple of days. My sister bought it for me as a birthday present.