Learn Mandarin: REAL EXCUSE ME to GO THROUGH a crow in China. Different SORRY & NO PROBLEM(2019)

1.How to GO THROUGH A CROWD with REAL EXCUSE ME in Mandarin in China?

2.Sorry: Duìbùqǐ对不起 VS Bù hǎoyìsi不好意思 in Mandarin.

3.No problem: Méishì没事 VS Méi wèntí没问题 in Mandarin

4.Any tricks to pronounce rang & guo in Mandarin?