In the following question, a statement has been given with highlighted text.…

Concept: An idiom is a fixed expression whose meaning cannot be worked out from its individual words, so it has to be learnt as a whole unit. In a replace-the-highlighted-text task, the expression to be chosen is the one whose established idiomatic meaning conveys the same sense as the highlighted words, and which also fits the grammar of the sentence frame around it.

Application: The highlighted words "get into trouble at all" express the idea of bringing harm or unpleasant consequences upon oneself; "at all" only intensifies the speaker's wish to avoid this. The English idiom "burn one's fingers" carries exactly this sense: to suffer harm or loss as a result of getting involved in something risky, especially by interfering in other people's affairs. The possessive inside the idiom agrees with the subject, so with the subject "I" it takes the form "burn my fingers", and the substitution reads: "I don't want to burn my fingers by advising others."

Cross-check: The remaining expressions carry unrelated idiomatic meanings, so none of them conveys the sense of the highlighted words.

• "Dig the grave" (from "dig one's own grave") means to bring about one's own ruin through one's own actions; it also needs the possessive "my own grave" to fit this sentence.

• "Come to a standstill" means to stop completely, so that no movement or progress continues.

• "Blow hot and cold" means to keep changing between enthusiasm and indifference about something.

Result: The highlighted words are correctly replaced by "Burn my fingers", giving the sentence "I don't want to burn my fingers by advising others."