When we got to the hospital, Mary _______ there. A. left B. has left C. had left
The students at this school always take________active part in volunteer work during the summer vacation.
—It’s kind of you to give me a ride to the station. —________。.
—Sorry,Tony.I took your school uniform________. —It doesn’t matter.
Tom,you can go out to play football after your homework________.
The camera________in 1827 by Joseph Nicephore Niepce.