Final answer:
The correct verb to complete the sentence is 'hacer'. It means 'to do' or 'to make' in English, and it is used to express the student's intention or obligation to engage in exercise.
Step-by-step explanation:
The correct verb to complete the sentence is hacer. The sentence should be: Tengo que hacer ejercicio. Quiero ser más fuerte. In this case, 'hacer' means 'to do' or 'to make', and it is used to talk about doing exercise. By using the infinitive form 'hacer', the sentence expresses the student's intention or obligation to engage in physical activity. This will help them become stronger over time.
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