Read the following passage about Ton That Tung's contributions to the medicine in Viet Nam. Mark the letter A, B, C, or D to indicate the correct word that best fits each blank.

Ton That Tung was a famous surgeon (1) ________ made great contributions to the medicine in Viet Nam. From 1935 to 1939, he performed operations on over 200 livers of dead bodies and analysed them when he (2) ________ the Indochina School of Medicine and Pharmacy. After the Revolution in August (1945), he worked as a private doctor to take care (3) ________ Uncle Ho. A few years later, he became the director of Phu Doan Hospital (Viet Duc Hospital today). In 1958, he was the first doctor to (4) ________ heart surgery in Viet Nam. Later, in 1960s, he found a new surgery method to reduce bleeding (5) ________ shorten the time for the operation down to only four to eight minutes.

1. A. whose              B. who              C. which                 D. whom

2. A. made               B. took             C. attended             D. discovered

3. A. in                     B. for                C. about                  D. of

4. A. perform           B. prevent         C. change               D. treat

5. A. but                  B. and               C. so                       D. for