Some young people these days just ________ go out of their homes to contact the real world．

—Must I take the medicine every day?— No, you______.

 --_____ you call back tomorrow? --Of course I can. 

She was greatly shocked at the scene before her eyes. Never did she expect that the local conditions ______ be so awful.

— What are you going to do this weekend?— I don’t know. I ______ visit a friend.