(2013·潍坊市高三二模)Sometimes smiles ________ be false, hiding other feelings like anger, fear or worry.

 –Look! The boy is running fast! –He might ______ to catch a bus.

I got close enough to hear them speaking Chinese, and I said “Ni Hao ” just as I ____ do in China.

That man in the corner of the restaurant ______ be Mr. Lee, for he went to Australia yesterday.

There’s enough time for you to go to the airport. You        hurry now.