This is         3-D printer. And this is an artificial (人工的) ear. Can you believe that scientists printed this artificial ear by this 3-D printer?

What do you usually have for________ breakfast?
A piece of bread and ______ egg.

--- Excuse me, have you seen _______ umbrella here?
--- Yes. Is it _______ beautiful blue one? I saw it here just now.

What do the neighbors think of Li Lei?
They say he is ______ lucky boy.
A. a       B. an      C. the

It is believed that travelling to Yangzhou in ________ March is ________ enjoyable experience.

My cousin Andy can play        piano very well, but he isn’t god at playing         basketball.

--What’s this ?
--It’s ________ egg.

- When were you born?
- I was born in 1989, _______ year of _______ Snake.

—What did ________ old man in red buy in your shop?
—He bought ________ umbrella.

He is__________ outgoing student from _________ university in America.