Where did you have the discussion with Professor Snow?—It was in the classroom ________ we had a biology lesson yesterday.

Would you like one more hamburger— . I think I am full.

________, 200 students went for the picnic, ____ some from No.2 High School.

They started off late and got to the airport with minutes to _______.

The Summer Palace is really beautiful. In fact, I doubt whether China has ________ park.[ ]