The word "forecast" is something like a copy of "predict," though the words are not exactly the same. The prefix "fore-" means before or prior to. Something in the "foreground" is in the front of a picture or scene as opposed to the "background." A "forecast" is something that looks to see what will happen before it actually happens. A weather forecaster is someone who makes such predictions about the weather.

The word "predict" has the prefix "pre-," which also means before. The "-dict" portion of the word comes from roots meaning to speak or say. To "pre-dict" is to "say before"—that is, to speak about an event before it occurs. Thus, it is a good synonym for "forecast." Indeed, it is basically its definition!

The word "preamble" is composed of two parts. The prefix "pre-" means before—as you likely know from words like "precede" and, of course, "prefix." The "-amble" portion is a bit rarer. It comes from the Latin for to walk and is found in words like "amble" and "ambulatory." (The latter means able to walk.) The "preamble" of a document is the beginning portion—the part that "walks before" the rest of the document. It is the "introduction" to the document. It does not necessarily outline or explain the document, though it can. Primarily, what it means to be a "preamble" is to be an introduction or a beginning to a text.

“Lawful” means allowed or within the law so “unlawful” must mean not allowed or not within the law. “Illegal” is the closest synonym. To provide further help, “despite” means regardless of something; a “famine” is a massive scarcity of food; “malevolent” means bad-natured and “benevolent” means good-natured.

When used as a verb, "function" means work. The prefix "mal-" means bad, so if something “malfunctions,” it stops working, works incorrectly, or breaks. "Break" is thus the correct answer. As for the other answer choices, “repair” means fix; "overlook" means miss some detail when considering the bigger picture, "trace" means outline or track down; and "mechanize" means begin to use machines to do something that previously wasn't done by machines.

The prefix "over-" means excessively, so “overconfident” means excessively confident, or "arrogant." As for the other answer choices, “meek” means shy and quiet; “cantankerous” means grumpy, angry, and easily annoyed; “quaint” means old-fashioned and charming; and "rude" means disrespectful.

In order to solve this synonym problem you have to consider both the prefix and suffix of the word "omnipresent." The prefix omni- means every, all and the suffix -present means place, where. So the word "omnipresent" means everywhere, in all places. To provide further help, "greedy" means wanting more than you have/need; "fortunate" means lucky and "unfortunate" means unlucky. Notice the impact of the prefix un-. 

The prefix anti- means against. So an "antidote" is something used against poisons, used to provide a solution to poison. This is closest in meaning to "medicine." 

To solve this synonym you need to rely on your knowledge of prefixes. The prefix du- means two of, so a "duplicate" is a second copy of something. It is common to make a "duplicate" of something if it is important and you do not want to lose it, like a "duplicate" key. 

To solve this synonym you will again need to rely on your knowledge of prefixes. The prefix dis- means away. So to "dispatch" something is to send it away. To provide further help, "lent" means let someone borrow. 

The prefix pre- means before, so "prevent" means to stop something before it happens. To provide further help, "accompany" means go with; "continue" means keep going; "dispatch" means send away; "displace" means replace, take over.