hmmm...can i ask about the visa?...how long would it take?....if his processing visa in shanghai.

Is it necessary to get a round trip ticket if i will going to visit him in shanghai?...but what if he wants to extend my staying in shanghai can he do that or cant?...since he will going to sponsor me everything..And my last question does a bank issue a official receipt(OR) if your going to ask a bank statement?...because the agency required us his bank statement and the official receipt,.so.,can he ask for a receipt?..thanks