People think that factory workers are more likely to get hurt at work than office workers. _1_, factories have very strict safety standards but safety standards in offices are often very poor.This_2_thousands of office accidents and injuries happen every year.
　　One of the_3_common problems in offices_4_air pollution.Poor ventilation (通风设施) and passive smoking are dangers to the_5_of all workers in the same office._6_common office problem is back and shoulder pain.Companies can improve the situation_7_they provide specially designed computer keyboards_8_their workers.They can also_9_adjustable（可调整的） chairs and desks in the office.Finally, office_10_can also happen if there are wet floors or broken carpets.Workers may slip and fall if office maintenance is_11_.
　　Many companies are more and more aware_12_office safety problems.They are doing something to improve the working conditions of their offices.