Not all activists champion … causes.

Analyze the question

The sentence is: "Not all activists champion ____ causes." You need the word that best fits with "causes" and makes sense with "champion" (to support or fight for something).

Explain the concept

This is a question on collocation, which means words that naturally go together. The phrase "worthy cause" is a very common English expression. It means a cause that deserves support, such as charity, education or human rights.

Step-by-step solution

• A. worthy: "worthy causes" is a standard collocation. The sentence means that some activists support causes that are not good or deserving. ✔
• B. real: "real causes" is not a natural pairing here. It also doesn't carry the sense of moral value that the sentence needs.
• C. concrete: "concrete" means solid or specific. We say "concrete evidence" or "concrete plans", not "concrete causes".
• D. favourable: This means advantageous or approving. We say "favourable conditions" or "favourable weather", not "favourable causes".

Answer

The sentence reads: *"Not all activists champion worthy causes.

Exam tip

For "best completes the sentence" questions, think about which word naturally pairs with the noun. Some pairings are fixed and you simply have to learn them, such as worthy cause, heavy rain, strong tea and concrete evidence. Reading widely helps you build this instinct. You've got this!