In my mind, no such_______ thing in our country as_______ Great Wall can represent the image and culture of China．

Steven, could you help me_______ when the plane will take off on the Internet? -I’m sorry, my computer doesn’t work.

Mike and I _______ net-friends. We talk on-line every week.

We put on new clothes _______ New Year’s Day. [ ]

Jack, _______ have you been away from your hometown?—Since the end of last February.