There (1) _________ four people in Minh's family, his parents, his sister and him. Minh’s father is (2) _________ engineer. Every day he goes to work at 7 o’clock. Minh’s mother is a doctor. She works in a hospital in the town. She goes to work (3) _________ 6.30. Minh’s sister is a student at Hanoi National University. She is twenty years old. Minh is twelve. He is a (4) _________ at Quang Trung School.What does his father do?