—My name is Maomao.
B.—What's your name?
—My name is Guoguo.
—Hi,boys and girls!
B.—Good morning,Mr Li!
—Hi,boys and girls!
—Good evening,Grandpa.
B.—Good night,Lingling.
—Good night,Grandpa.
—Fine,thank you.
B.—How are you today?
—I'm fine,thanks.
—Goodbye,Maomao!
B.—Goodbye,boys and girls!
—Bye-bye,Miss Li.