Ask questions about the sentence: 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?
2) Who proposed that we come to school for 15-20 days in April?
3) Where did the Head Teacher propose we to come?
4) When did the Head Teacher propose we to come?
5) How long did the Head Teacher propose us to stay?