a. A:Nice to meet you! B:Nice to meet you, too! 
b. A:Goodbye.See you later! B:Bye!
c. A:Where is my book? B:It’s under the desk.
d. A:How do you feel? B: I’m very cold.
e. A: What are they doing? B:They are playing.
f. A:May I have two books? B:Thanks. 
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