----- Now that you like the portable personal computer so much, why not buy one? It is of great use to your work. ---- Well, I can’t afford _____ computer at present．

---Students should devote most of their time to studying rather than playing computer games.                                                       ---________.No pains, no gains.

 Jim went to answer the phone.   , Harry started to prepare lunch.

  -----When will they come back? 　　-----I _____ don’t know.

Laura wanted to play a joke on her father but gave herself________by laughing.