Look, the old man who is playing_______ guitar is ______ university teacher.
I can’t get __________ the door because there are too many people standing there.
__________it is to go camping ___________ fine day.
--- How long have you studied French?--- _______ .
---With 4G mobile phones, people can even see each other as they talk.---Really? Would you show me it, please?
---He’s never been late for school, _________ he?---_________. He always comes on time.