The machine has been used many years_____ it doesn’t work well occasionally

ndred percent _______ to your studies, though itcan be lonely and no fun at all, will leave precious marks on your youth.

The China National Environmental Monitoring Center ____ air quality in urban areas from levels one to five: excel-lent, fairly good, slightly polluted, poor and dangerous.[ ]

Sally’s never seen a play in the Shanghai Grand Theatre, _______?

With the red skirt her, Jane looks prettier.— Yes. I’m a little green envy. I wish I were as pretty as her.