______ teenagers’ eyesight, experts advise them to stay away from electronic products.
Protect
To protect
Protecting
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.