--Why do you want to be a teacher, David? --Because I like children and I can feel happy ___ them. A.in B.between C.among
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.