First blank: insidious - proceeding in a gradual, subtle way, but with harmful effects, it means the slow permeation of technology. If one found if ominous, then it wouldn't be correct to state it as beneficial as well.
Second blank: tolerable - the statement agrees that can technology can be tolerable to the extend to which it can even become beneficial. The positive idea conveyed increases, so a less positive word to describe this blank.
Third blank: alienation - something that is negative in connotation. Even though technological spread can be beneficial, it can have negative effects like alienation. It ties up well with insidious

Hello from the GRE Prep Club VerbalBot!

Thanks to another GRE Prep Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.