“Amass” means gather or "collect." As for the other answer choices, to “tamper” with something means to interfere with it, or to mess around with it so that it breaks; “interject” means interrupt the flow of a conversation with one's own comments; “intervene” means get involved to stop something from happening; and “bellow” means shout or yell loudly.

To “procure” means to get something or to "obtain" something. As for the other answer choices, “furnish” means provide; “peddle” means sell, “barter” means trade, particularly to try and buy something for less money than it is worth, or to obtain something through exchange and not direct purchase; and "demonstrate" means show to be the case.

“Fluctuate” means change in quantity randomly, or "vary." As for the other answer choices, “eerie” means spooky and suggestive of danger; “hoary” means old and having white hair or clichéd; “surreptitious” means stealthy or secretive; and “meticulous” means careful, considering all options, and dedicated.

The word "restrain" comes from roots that mean to tie back. It is related to words like "restrict," "restrictions," and "stricture." When we restrain our words, we hold them back so as not to say something nasty. When we physically restrain someone (with "restraints"), we hold them in place so they can't move. In this case, we contain them within a given space or locale. Thus, the best option is "contain."

"Affix" means to fasten something to something else and closely matches the common word "attach." "Correct" means right or proper. "Include" means to add something to a group, "bloat" means to make something unduly large, and "harm" means to hurt.

"Truncate" means to shorten, to abbreviate. To provide further help, "deviate" means go away from, turn away from; "augment" means enhance, make better; "relocate" means move; "extrapolate" means to take further, to think beyond. 

To "atrophy" means to weaken, to waste away, to wither. It is generally used to describe the weakening of muscles, as in "muscle atrophy." To provide further help, "jettison" means discard; "plunder" and "pilfer" both mean to steal. 

To "stymie" something is to hinder it, to prevent something from developing. To provide further help, "assist" means help; "suspend" means pause; "discern" means recognize and notice; "sanction" means approve. 

To "festoon" something means to decorate, to adorn. To provide further help, "reside" means live; "exculpate" means acquit, free from guilt; "reinforce" means provide support for; "hinder" means get in the way of, make something more difficult. 

To "expunge" something means to remove it, to remove it from the record. To provide further help, "acquit" means pardon; "permit" means allow; "forbid" means say something is not allowed.