He threw away his cup and became even happier. Which of the following is correct for the underlined word in the sentence?
After he finished ______ the exciting story, he talked about it on and on with his friends.
— ______ 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.