Do you know where ______________?
--Haven't you seen Mr. Wilson at the lecture?--Yes, but he had left _________ I could ask him any questions.
---Excuse me,I want to buy some milk.Where can I find a supermarket?---Oh,I know ________ not far from my home.
--- ___________?--- That would be great! Please drop me off at the library.
The river smells terrible. People_______ dirty things into it .
---Miss Li, where did you visit last week?--- I visited a big company __________ ships are made.