31.   Developing countries in Asia and Africa have been even harder hit by the disease, with heterosexual sex as the main mode of transmission, she said.

32.   The SES chief, however, believed the human voice will remain the main mode of business in stock trading.

33.   The SES chief, however, believed that the human voice will remain the main mode of business in stock trading.

34.   The main mode of HIV transmission is through heterosexual sex in the Philippines where the use of contraceptives is opposed by the dominant Catholic church.