"Container" can work because it is a very broad term. "Bin" is also fine.

In many cases you could use either, but "register" is a bit more official or formal. If the class is having a party and you put your name on the list to bring cookies, you would "sign up". If you fill out a government form to vote in an election, you "register". If you enter your information online to do a running race, you could say either "sign up" or "register". Basically, if there is official paperwork of some kind "register" can work, but if it is just a casual circumstance, "sign up" is better.

"I can't believe that she did this to you" is most likely the sentence you are looking for. It suggests she did one bad thing. It would be possible to say something like "I can't believe that she had done this to you twice before" if there is a repeating action of some kind, but the sentence would need to include some extra description, like I added.

Put things this long into the notebook section; it's easier to correct there.

I'm not sure entirely what you're asking, but I can try to guess... An abandoned person might feel "loneliness" A cheated person might feel "betrayal" An excluded person... I'm not sure if there is a good one-word feeling..."loneliness" and "sadness" both, I guess An aggrieved person would feel "grief" I suppose... Was this at all what you were looking for? If not, maybe explain more clearly what you're trying to understand.

I think grammatically they are mostly interchangeable (in those specific contexts of emotions) but some I would hear more one way than the other. "I ran away in horror" (not with) "I was paralyzed with fear" (not in) "Her cheeks turned red with/in shame" (both okay, although I think "with" is more common in this context) Sorry I don't know a good rule to use... as I said before I don't think there are many circumstances where one is actually wrong, but it just might sound odd to a native speaker.

Probably in that case the best answer is B, although other options are also grammatically correct. "Get ready for" and "prepare for" are interchangeable, although "prepare for" is a bit more formal. "Get ready for" and "prepare for" are talking about the future - the person/people are not currently ready - there are still things to do before they are ready. If they "are ready" that is the present, they do not need to do anything further.

In fact, you could take "that" our of that sentence more easily than you can take out "it". "I thought that it was a merger" and "I thought it was a merger" are pretty interchangeable sentences. If you say "I thought that was a merger" it contains a lot more confusion/immediacy than is really appropriate in the sentence. For example, if you and a friend are hiking in the woods and see something furry go past which startles you, but then turns out to be a dog, you might say "I thought that was a wolf!" But there is no circumstance in which talking about a merger should be so alarming. I'm not sure I've explained that very well...