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?