—Tom, you look tired this morning. What’s wrong?—I was so busy that I didn’t go to bed________12 o’clock last night.

We must hurry up, ________ we’ll miss the plane.

 Yunnan is       colorful     millions of people come to enjoy themselves every year.                                                                      

My favorite teacher is Miss Lin, although she has _________ experience.

It _______ them two weeks _______ the computer last year.