You may easily lose your way in Shanghai ______ you don’t have a map or a guide.

What shall we do this weekend?— You can go swimming, hiking, or ______ else you enjoy doing.

We are going to have fun ____ English together.

Do you believe that paper is made _____ wood?—Yes, I do. And you can see that books are made _____ paper.[ ]

Please sit_____ your chair and listen_____ the teacher. [ ]