a) Have you thought calling a doctor?
b) Have you thought of calling a doctor?
c) Have you thought of considering calling doctor?
d) Have you thought of calling doctor?

2. Which of the following sentences is correct?

a) Have you consider calling a doctor?
b) Has you considered calling a doctor?
c) Have you considered calling doctor?
d) Have you considered calling a doctor?  

3. Which of the following statements is correct?  

a) Asking a question is a good way to communicate advice indirectly.
b) The present perfect is always followed by a gerund.
c) You shouldn’t give sensitive advice.
d) All of the above.