Some gender confusion. "Hoc" is neuter, and the form therefore serves both the nominative and accusative cases. Because it is neuter, "this thing" is accusative, and is the correct translation. "Hunc" would be "this man".

Liz's answer:

sorry, Joe, but when you said 'hunc' would be a man I laughed. What a hunc! Never made that connection before.

Joe Ireland's answer:

No, it can't. "Is .. ea .. id" is normally an adjective meaning "this" or "that". Here it is masculine dative to agree with "libro", and either of those two translations would suit.

Gary Schultz' answer:

My Latin dictionary simply says that this verb takes a double accusative in this usage. Other languages (e.g., Greek) also have such double accusative verbs. The Latin verb doceo, which appears in Wheelock's Chapter 8, is another such verb (as it is in Greek) -- one can teach someone something, which results in two accusatives. For some reason, Wheelock skirts the issue directly, except to insert the usage into an exercise unannounced, just to confuse his students!

Joe Ireland's answer:

It is really just a polite idiom. It could be considered redundant; though perhaps it might be more useful to consider it a "polite intensification". Same sort of thing as "Good luck to you" drawing the response "And the best of luck to you". If you wanted to be archaic, it might be "Fare thee well", replied to by "Fare thee very well." In modern parlance, it would just be "Goodbye", and "The same to you".

Joy's answer:

I translated bene as "quite" in order to give added emphasis to the sentence.

As I've said before, don't worry about learning all the meanings of "ago". "Ago" is an all-purpose verb; it simply means "do the obvious thing to the direct object". We do the same sort of thing with nouns in English -- "So, I hung the whatzis on the whatchamacallit...."

That's for emphasis. Emphasized words and phrases always go at the beginning or end of a sentence. Remember that this was a speech, and his original hearers heard him one word at a time. Cicero has just said that Catiline has marked them for death, so now he begins, "For death *you*... At that point, before hearing the rest of the sentence, his hearers could fill in the blank, with an implied "should be marked".

Yes.