It is not socially for parents to leave children unattended at that age.

Who________ for the pollution of our earth

Every year, about six million people die from smoking—related diseases in the world, ______ one million in China, according to the WHO.

In no city of China ______ little about the economic development.

By nine o’clock, all the Olympic torch bearers had reached the top of Mount Qomolangma, _______appeared a rare rainbow soon.