actory produced much dirty water, which resulted in a wide _______ of environmental problems.

Once ____, Mount Tai will never beforgotten.

By doing part time jobs,students can social experience necessary for their future life. [ ]

The office isn’t _______. Will you please turn onthe lights— Sure.

The documentary A Bite of China II《舌尖上的中国》is quite popular around China recently. What do you think of—