Sentence 4 because it summarizes the paragraph but does not give an opinion like answer but used factual evidence to support it.
I'm going to need more information on this, though. Sorry.
To do so, I guess I'd say use proper grammar and format.
Although your sister isn't someone to write formally to, if you write properly it's good to do in the end
Lol i assume this is what you mean?
Never seen that question before I would say the correct adverb would be sank
(problem) I can't find my pen
(solution) ask someone to lend you one or retrace your day and look around for it.
I'm not sure if I answered this right but I tried
