根据句意,用恰当的介词填空1.what are the dought the coming vacation2.My u

根据句意,用恰当的介词填空
1.what are the dought the coming vacation
2.My uncle is hiking the mountain this friday
3.my best friend sent me these phtots hong kong
4.l’ll show you how to do it when l get back school form San francisco
5.cathy's fathe is going to Hawaii December 4th