―Did you have a sound sleep last night?―Yes, never slept________.     

 The world is getting smaller and smaller because the Internet gets us       .

Of the two pens, the boy bought ______ expensive one at last.

If you want to be thinner and healthier, you should eat___food and take____exercise.

Eighteen kids died in the school bus accident in Gansu Province. It’s _____ one that I have ever heard of.