**Rule: Understanding Idiomatic Expressions.** The idiom 'move heaven and earth' means to do everything one possibly can to achieve a goal. It implies a huge amount of effort and determination. Option (c) is the correct definition. Option (a) is a literal misinterpretation. Option (b) is the opposite. Option (d) is a possible part of the effort, but not the whole meaning of the idiom.

**Rule: Understanding Idiomatic Expressions.** The idiom 'a pack of lies' is a strong way of saying that a statement or story is entirely false. The phrase 'from start to finish' reinforces the completeness of the falsehood. Option (c) is the correct definition. Option (a) is the opposite. Option (b) is a literal interpretation. Option (d) describes complexity, not truthfulness.

**Rule: Understanding Idiomatic Expressions.** The idiom 'second to none' is a way of saying that someone or something is the very best. If you are second to no one, you are first. Option (c) is the correct definition. Options (a) and (d) are misinterpretations of the word 'second'. Option (b) is the opposite.

**Rule: Understanding Idiomatic Expressions.** The idiom 'too many chiefs and not enough Indians' describes a situation where there are too many people giving orders and not enough people to carry them out. This leads to inefficiency, as suggested by 'nothing gets done'. Option (b) is the correct explanation. Options (a) and (d) are incorrect interpretations of the words 'chiefs' and 'Indians'. Option (c) is the opposite.

**Rule: Understanding Idiomatic Expressions.** The idiom 'read the riot act' means to issue a stern warning or scolding to someone to stop their unacceptable behavior. This is a common action for a teacher to take with 'misbehaving' students. Option (d) is the correct definition. Option (a) is the literal origin of the phrase. Options (b) and (c) are the opposite of a stern reprimand.

**Rule: Understanding Idiomatic Expressions.** The idiom 'off-the-cuff' describes something said or done spontaneously, without any prior thought or planning. Spontaneous remarks are often more likely to cause 'controversy' than planned ones. Option (b) is the correct definition. Option (a) is a possible origin of the phrase, but not its modern meaning. Option (c) is the opposite. Option (d) describes the content, not the manner, of the remarks.

**Rule: Understanding Idiomatic Expressions.** The idiom 'on a roll' means to be experiencing a sustained period of success or good fortune. Winning 'ten games in a row' is a clear example of such a successful streak. Option (b) is the correct definition. Option (a) and (d) are literal misinterpretations. Option (c) is the opposite.

**Rule: Understanding Idiomatic Expressions.** The idiom 'a pain in the neck' refers to a person or thing that is a persistent source of annoyance. 'Constant criticism' would certainly be annoying. Option (c) is the correct definition. Option (a) is a literal interpretation. Option (b) is the opposite. Option (d) is unrelated.

**Rule: Understanding Idiomatic Expressions.** The informal idiom 'a couch potato' refers to a person who leads a sedentary lifestyle, spending a lot of time inactive, typically on a couch. The suggestion to 'go outside for some exercise' highlights this inactivity. Option (c) is the correct definition. Option (a) is a nonsensical literal interpretation. Option (b) is the opposite. Option (d) is an unrelated profession.

**Rule: Understanding Idiomatic Expressions.** The idiom 'keep one's fingers crossed' is an expression of hope that something will be successful. It is a gesture or phrase used when one is wishing for good luck. Option (c) is the correct definition. Option (a) is the literal action, but the meaning is figurative. Option (b) and (d) are the opposite of hoping for success.