Задайте вопрос начиная со слова в скобках. this fox is in the bag.(what)

1. she wasn't invited to the party (by them).

2. the windows weren't left open (by me).

3. the light wasn't turned off (by them).

4. some friends has been invited to tea (by me).

5. an english book has been given to me (by her).

6. has the letter been written yet?

7. a lot of interesting things have been told to us (by them).

  dolphins are cleverer than whales.  horses are taller than dogs.  cats are bigger than mice.  tigers are faster than dogs.  snakers are longer than lizards.