3 . Dr. David Sullivan, pediatric dentist（儿科牙医）, is just wild about teeth. So are some of his_________. Wild, that is. Really wild.

You see. Dr. David, as many people call him, has some_________patients. They aren’t the children he_________sees each day. They’re, well, big and hairy and sometimes weigh more than four hundred pounds. They’re_________animals.

On most days, Dr. David tends to his human patients, teaching them how to care for their_________.On some days, however, the Cincinnati Zoo calls with some special work for him to do. Since 1982, Dr. David has volunteered his time performing_________surgery on many of the animals. This would be a_________experience for most.

_________, Dr. David feels differently. “I’m not_________of the animals,” he says, “I have been around them so much that I'm used to them.” How does a children’s dentist find himself__________the teeth of a black rhino or a monkey? For Dr. David, it was a matter of__________

“When I was a kid in school, the only thing I ever__________to be was a veterinarian（兽医）,”says Dr. David, “I even applied to veterinary school in college.”

But Dr. David soon__________that veterinary work was__________for him. “I volunteered at a veterinarian’s office to get some experience,” he says, “I was__________I couldn’t breathe. My eyes were swollen shut. I had allergy symptoms（过敏症状）.”_______Dr. David tried pediatric dentistry and found he loved it.

After he became a dentist, Dr. David__________at Children's Hospital in Cincinnati, Ohio. While there, he was asked to help with dental work on some of the__________in the hospital’s research lab. It wasn’t long before he began a dental program for the animals.

Word of Dr. David’s work with animals__________, and soon King’s Island Amusement Park and the Cincinnati Zoo were calling to ask for his__________. Now he regularly gets calls from the zoo.