sorry, i'm not sure what you mean here. If you specify the question a little bit more, I'll be able to help you! :)

it means to use the necessary means to survive in a socially tough environment. Perhaps the culture surrounding people interaction is very intense, and one must use their wit and brains to just survive on social interaction basis. However, in today's day and age in 2017, the world is very accepting of multiculturalism, so I would presume 'social survival' won't be a term you have to use that frequently. As a native speaker, I do not come across this term regularly. Thanks for asking. Let me know if you want instant tutoring! :)

The only correct phrase will be 'How wrong are you?' :) The quantifier 'much' must refer to something countable, yet the degree to which something is wrong is not something that can be counted in numbers, therefore the quantifier cannot be correctly used together with this phrase. I hope this helps. :)

across in this context means the total stretch of land that meets at the Liaoning province and North Korea. The area where both of those territories share the border. And all three of the sentence structures work, it depends on what meaning you are trying to convey that will affect your choice of preposition. I hope this helps...

what makes you happiest. ;)

McCain is asserting that his supports free trade while giving examples of our recent president Obama opposing the Columbia free trade.

it means 'as small as' or 'not bigger than me' or possibly 'same size as me'. This type of phrase is used when you are being competitively sized up with someone and you want to feel just as strong as your opponent. he has got his football honor is a little grammatically incorrect. It means he won a award in football. Football is a physical contact sport so a 'honor' is not a emotional award that is often bestowed on it like as a military medal. However, in this context, it most likely means an award..

good question. I would suggest that although 'he's easy to work for' does make grammatical sense, in fact, it's a bit socially awkward to structure the sentence that way... Let me explain, when you suggest that someone is easy to work for, it usually means that they are not too strict, quite loose, and in general, a very easy going person, almost to the detriment of that person. This makes the allocation of authority in the subject of the sentence confusing, and almost makes the sentence seem like a joke. It would be better to say that someone is 'good' to work for. I would go with Gary's answer above as well.. upvote my answer if it helped you, thanks in advance! I'm trying to get students!