It is so difficult for the disabled people____(open) and ___

It is so difficult for the disabled people____(open) and ___ it is ___ difficult for us___climb the mountains 选哪个 smog can also make it difficult for some people____ It's my present,and open it for ___ ,please. The twins are so much alike and it is difficult to tell one it is so difficult for sb to do sth,difficult用so形容对吗? The shop (opens) at 8:00 am and it (is open) for ten hours e It is difficult and inconvenient for/to you ... The question is so difficult that nobody can answer it 英语翻译but the resistance is not out in the open.It’s difficult the problem is difficult ___ . The math problem is so difficult that he can't___ ___ ___.他算