Since all of the three answer choices fit the first blank, you must read the entire passage first, for context. The phrase “breaches of privacy” suggests that the Internet is a place where unauthorized third parties can obtain data. Choice (C) reliable doesn’t quite fit this context, so you can rule it out. And while it may be true that content posted on the Internet is not always  ( A) sensible, there is no context in the sentence to support this idea. Choice  ( B) secure is most applicable to the issue at hand, so it is the correct choice. For the second blank, choice (F) constrain means “to get under control,” (D) castigate means “to criticize or punish,” and (E) relinquish means “to surrender.” Relinquish doesn’t make sense, and while authorities might try to castigate the people who hack into   Internet users’ private information,   officials do not   punish the privacy violations themselves. So  ( D)   and (E) can   be ruled out, and (F) is the correct answer. While one could be (G) indignant about (angry about) a loss of privacy and (H) skeptical of (doubtful of) the security of one’s data online, the only choice that makes sense relative to “the exchange of personal data” is (I) prudent in. Given the difficulty in maintaining Internet security, one must indeed be careful about transmitting personal data.