Ask questions about the sentence: the head teacher proposed that we come to his school for 15-20 days in april 1/ did 2/ who 3/ where 4/ when 5/ how long

The head Teacher proposed that we come to his school for 15-20 days in April.
1 Did the head teacher propose that we come to his school for 15-20 days in April?
2 Who proposed that  we come to his school for 15-20 days in April?
3 Where  do we come  for 15-20 days in April?
4 When do we come to school for 15-20 days?How long do we come to school in April?