1．The street is busy, _______ _______?(完成反意疑问句)
2．Have they travelled on a train?(作出否定回答)
       __________________________________________
3. They were so tired that they couldn't walk any longer.(改为同义句)
  They were _______ tired _______ walk any longer.
4. All of us want him to rest.(改为否定句)
    _______ _______ us _______ him to rest.
5. They spent ten years building the bridge.(改为同义句)
  It _______ them ten years to _______ the bridge.
6. She can't speak English or French.(改为同义句)
She can speak _______ English _______ French.
7. They have already finished their work.(改为一般疑问句)
  ______________________________________________
8. She has to clean the room twice a day.(对画线部分提问)
   _______ _______ does she have to clean the room?