---Did you _____ who cleaned the classroom? ---Yes, Sam did. A. find out B. look for C. put out
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.