______ these pictures, I couldn't help thinking of those days when I was in Beijing and ______ from the top of a thirty-storeyed building, Beijing looks more beautiful.
We must do whatever we can ______ those who are in trouble.
—Have you handed in your schoolwork yet? —Yes, I have. I guess it ______ now.
You can never imagine what great ________ we had _______ your school last time.
— _______ — I said you’d better go by bus.
I ______ for London tonight, for there is ______ an important meeting there.