Why is________ you are so late for the class?

Which basketball player do you like best, Kobe, James or Jordan?—________ of them. Jeremy Lin is my favourtite.

These Maths problems are too hard to ______. Can you help me?—There are many ways, but the most important is to try your best.

“How long does it take you ­________to Beijing?” “More than three hours.”

Can I borrow your dictionary? — Sorry, I don’t have __________.