This same question was recently asked by you on English Language Learners wasn't it? I believe the answer there was that none of them are correct because all of them should say, "the Internet". Once that is fixed, then the only viable sentences are the ones that use "for the last few days", "in the last few days" and "in a few days". Although the meaning of the last one is different.
adverbs - The variations of in/for the last few days - English Language ...
So when we say 'the past few days' we mean the complete set of 'past few days', not just some of them, and which means this time phrase matches the tense. Do we use the phrase 'past few days' on its own? Highly unlikely, it lacks a sense of which days.
meaning - Past few days or the past few days? - English Language ...
Is if you're treating the two days as a single length of time; are if you're treating them as multiple lengths of time.
Two days "is" or "are"? - English Language & Usage Stack Exchange
Sometimes I use the phrase "back in the old days". I was recently in a class where the trainer kept using the phrase "olden days." Which usage is acceptable?
"Old days" or "olden days"? - English Language & Usage Stack Exchange
It will be used in a tabular data program to show information about free work days of employed and each column can't have enought space to include full week day name. For "common form" I mean, what are the abbreviations that is more used in programs.
Gone are the days when a school or institution could count on being able to offer a standard curriculum and traditional programs to a steady stream of students and their parents. Gone too are the days when communication was top-down Gone are the days of local entertainers coming to play or perform free.
'Gone are the days when ... ' Is this expression often used?
In Australian English, "in the upcoming days" sounds strange. "In the coming days" is acceptable but probably too formal, I agree with @BoldBen's comment that "In the next few days" is a better choice.
The form must be filled out within 10 days before the flight. Fill out the Entry Form within 10 days before your flight. What is the meaning of within in these sentences? Is it before 10 days before the flight? or Is it after 10 days before the flight? I.e. 8 days or 5 days or even 1 day before the flight is ok (even the same day as the flight)?
Words exist to label periods of time - like week which represents 7 days and fortnight which is used for a 14-day period. Are there other such words used for certain numbers of consecutive days?
synonyms - One word substitutions for number of days? - English ...
I would read the first as referring to a deadline, the second referring to a total accumulation of days spent. For example, "This project must be finished within 30 days" is different than "This project must be finished in 30 days or fewer." - The first establishes a "date" the second just establishes a duration/or level of effort.
Logical meaning of "within 30 days" compared to "in 30 or fewer days ...