当别人帮助了你, 你应该说 “___ _”。A. OK. B. Thank you. C. Yes.
---Where did you get the dictionary? --- From the library. And I have ______ it for two weeks.
The accident happened ________ the afternoon of April 15.
After playing football about half an hour, the students took _________ rest.
It is said that potato chips ____________ by mistake about a hundred years ago.
She told us a story. Her voice sounded ___________.