-Hi, I didn't know you had come back! Have you finished your teaching in America?-Yes. I______Chinese there for more than two years.
I’m really tired _______ Tom.. He had me _________ for two hours in the rain.
Those experienced doctors in our country _______the meeting in order to find out the real_______ of bird flu(禽流感).
I shall never forget the days_________ I lived with my parents as a child, _________ has a great effect on my life.
If you cheat in the exam, you could hardly _________ it.
Don’t worry about Mary. _______ , she is no longer a child any more.