They are very similar but have slightly different meanings. "Giving the cold shoulder" usually means that the person not responding to you is deliberately ignoring you because they're angry with you about something. "Leaving you hanging" just means that they're ignoring you for any reason.

For number 1) you could saying "he got screwed" is perfectly fine. You could say "He got the short end of the stick" if you just wanted to imply that he had to pay for it all instead of paying half or not at all, but that saying is more for when the situation is out of anyone's control and they weren't trying to do something sneaky. "He came off worse" does mean that he got the worst half of the deal, but it's just not a saying that a native speaker would use in this situation 2) Either one works, it just depends on how specific you want to be. If they've been in the bathroom for 20 minutes, then "Could you go" would be better 3) "Here's some tips for you to save time on the SAT's hard questions"

It depends on what you mean. Are you asking if the meeting is today and we reschedule it to occur Tuesday? Or are you asking if the meeting that's scheduled on Tuesday can be set up differently?

If your mother hasn't taught you anything about how hard life is, that doesn't mean you would remain the way that you are. You have to learn on your own. I've wondered whether I should write this letter or not, after my decision has been taken, I think it is the best thing to do. (what do you mean the decision has been taken? That something that wasn't under the speaker's control happened? If so, the middle part should be, "but after what happened, I feel it's the best thing to do" "In despite of what I just said" is the beginning of the sentence, there has to be a second part, "In spite of what I just said, please do ____ instead" All your other sentences are correct

For the most part they mean the same thing, it just depends on which word the speaker chooses. There are a few situations were they would be different just in terms of the situation. Let's say that you want to steal a painting and 1 of your friends who didn't know what day you were stealing it told the cop on you, you can't figure out how your friend found out the date no matter how many times you think over what you said to your friend, "How could he have known?" would be appropriate. You know for sure this person knew the date, but you don't know how they know For the second situation, let's say you're stealing the same painting, but your friend is supposed to help you. However because of something unexpected happening, the date is of the heist is changed. However your friend goes on with his half of the plan because no one ever contacted him about the changes. "How could he have known" would work because there's no way he could've known about the changes because no one told him

Yes, they are the same, however "She often plays young girls" is more common