It’s polite (礼貌) to say “_________” to your parents (父母) when you leave (离)home for school.A. Goodbye B. Hello C. Good morning
——“_______are you, Mr. Chen?” ——“I ’m fine.”
——“What’s this in English ?” ——“_________”
——“Good morning! ——“_________!”
Hello! What _______this?
--What's this _________English? --It's a clock. A.of B.on C.in