Rewrite the sentences, beginning as shown, so that the meaning stays the same

Rewrite the sentences, beginning as shown, so that the meaning stays the same.
  1. You forgot to turn off the TV last night, didn't you?
=> You didn't remember __________?
  2. I think you should go to work by bike.
=> Why don't __________?
  3. Mr Long lived in the countryside when he was a child.
=> Mr Long used __________?
  4. We will plant more trees along this street.
=> More trees __________?
  5. Is pollution the most serious problem?
=> Pollution is __________?