Fill in the blank with the most appropriate word.

The doctor often made his patients ______ for long

The correct answer is 'wait'. 

Key Points

• The most appropriate word for the given fill in blank is 'wait'. 
• We know that in The English verbs let, make, have, get, and help are called causative verbs because they cause something else to happen.
• The correct structure of the given sentence is: 
  • MAKE + PERSON + VERB (base form). 
  • Example: After Billy broke the neighbor’s window, his parents made him pay for it.
• Therefore, in the given sentence 'base form' will be used. That is 'wait'.
• Hence, the correct answer is Option 2. 
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Correct Sentence: The doctor often made his patients wait for long. 

Mistake Points

• We tend to go for Option 1 that is 'waited' but it would be wrong because we know that 'make' is a causative verb. And after it, the 'base form' of the verb should be used. 
• Therefore, the correct answer is Option 2. 

Additional Information

• The other rules of 'causative verb':
  • "HAVE" means to give Someone Else The Responsibility To Do Something. 
  • There are two types of structures in this kind of case: 
    • HAVE + PERSON + VERB (base form)
      • Example: I’ll have my assistant call you to reschedule the appointment.
    • HAVE + THING + PAST PARTICIPLE OF VERB
      • Example: We’re having our house painted this weekend.
  • "GET" means to Convince/Encourage Someone To Do Something.
  • The grammatical structure, in this case, is: GET + PERSON + TO + VERB
    • Example: I'll get the architect to modify the plans.