When______ what his plan for his summer holiday was, he got very excited.
— ______ did you visit the Great Wall? — Last Sunday.
Roast duck is one of _______ dishes in Beijing.
I’d like to go swimming with you, ______ I am too busy today.
I ______ in the hospital yesterday. I had to look after my sick mother.
— May I smoke here? — No, you ______ . This is a no-smoking room.