根据对话内容,写出句中所缺单词
-Why did you go to Beijing last week?
-Oh, I went there on _______. I talked about a project with other companies.
-Come on. We only have 5 miles left.
-I'm _______ out and I can't go any further.
-It's dangerous. You should tell your brother not to go sailing alone.
-But he has already made up his _______ to do so.