1：Why do some people throw garbage on the street?
Throw Garbage，扔垃圾，我们也可以说Chuck rubbish;或者throw away some litter。这些我们都可以用在同义词替换中。
On the street也可以替换成on the ground，或者on the road。
Why do some people throw garbage on the street?
Well, I don’t really get it why some people chuck rubbish right on the road everywhere they go. Perhaps one of the explanations that might make sense to me is they can’t see a bin around, though I’m not sure if it’s the right thing to do. I mean at least I wouldn’t do a thing like that.
I don't get it意思是“我也不知道/我也不理解...”。
one of the explanations可以替换为one of the reasons。
make sense to me意思是：
Fail to understand
not sure if it’s the right thing to do
2：How do you feel when you see people throw garbage on the street?
Well, most of the time, when I notice someone doing it, I would feel a bit pissed off, but to be fair, there’s nothing I can do really. In fact, I would probably just roll my eyes and pretend that I’m not really bothered.
most of the time 我们可以用usually。
pissed off可以理解为“不开心/生气”，或者说I would be in a bad mood。
to be fair，“老实说...”，可以用to be honest。
roll my eyes是“翻白眼"的意思，或者说give someone the evil eye。
I’m not really bothered 也可以说I can’t be asked/I can’t care less/I don’t care/I don’t seem to bother(care)。