______black—headed gulls(红嘴鸥) come to Kunming to spend their winter every year.
If you don’t go to the meeting tomorrow, _______________.
---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.