A:Does your sister a CD?B:Yes, she .
---Whose book is this?---It________ be Ning’s because it has her name on it.
There are ______________ birds there in the sky.
I think teenagers ____________ to choose their own clothes.
---Lucy _________ really quiet but now she is very outgoing. ---Yes. She has changed a lot.
---How do you learn English? --- I learn English__________ making flashcards..