Jack did not feel ______(good), so he ______(go) to see a doctor. The doctor looked him up and down, and said nothing. The patient _______(want) to know what _______(be) wrong with_____ (he). But the doctor ________(continue) to look him up and down without saying anything. At last the patient ______(ask) the doctor, "What do you think is wrong with _____?" the Doctor said, " I _______(not know)_. I_______(try)__ to understand what kind of illness you can pay for?"