The alternative which correctly replaces [PARTICLE] is 
The underlined sentence Applets in the pen cant float word balloons at you unless you permit them to do so can be paraphrased as Applets in the pen 
In the text, uninvited guests refers to 
In the text, the meaning of pen is 
The words in the groups below have either a positive or a negative meaning, according to their usage in the text. Check the alternative in which the group is NOT formed ONLY by either positive OR negative words. 
According to the text, 
According to the text, 
In the text, a cinch means This text refers to questions 40 to 43.
In the fragment, "lured him into boasting that Americans admired him" (l.38-39), the words "lured" and "boasting" mean, respectively,
According to the text, businesses 