This question tests your understanding of verb patterns and sentence structure in English. The correct answer depends on the grammatical construction following the phrase "clever at".

The phrase "clever at" is followed by a gerund (a verb ending in -ing that functions as a noun). Therefore, the first blank must be filled with "making".

The second part of the sentence involves the structure of the verb "make". The correct pattern is "make + object + base verb (without 'to')". This means you "make someone do something", not "make someone to do something".

Let's break down the correct sentence:

She is very clever at making people think her ideas are their own.

• "making" is the gerund that correctly follows "clever at".
• "people" is the object.
• "think" is the base form of the verb, completing the "make + object + base verb" structure.

Therefore, the correct option is the second one: making / think.

Related Topics & Formulae

Gerunds after Prepositions: Prepositions (like 'at', 'in', 'on', 'of') are typically followed by a noun or a gerund.

Example: She is good at painting. I am interested in learning French.

Causative Verbs: Verbs like 'make', 'let', and 'have' can be followed by an object and then the base form of another verb.

Pattern: Make + Object + Base Verb

Example: The teacher made the students redo the assignment.