Listening to loud music at rock concerts ______caused hearing loss in some teenagers.

 In the office I never seem to have time until after 5:30 pm, _____ many people have gone home.

The population of China ________ 1.3 billion，and 80% of the population________farmers.

 Our school has about 100 computers, but only sixty percent ____ used regularly.

I feel it is you rather than the girl who ______ for being late for the speech.