Her shoes ____ black. Her ____ are grey. 

To reduce food waste, we should only order as ___________ as we need and try to eat it up.

No news ______ good news.

 Many a student ________ failed in the biology exam，and Tom is the only one of them who ________ decided to give up the course.

Listening attentively in class and reviewing in time _______ a sure way to improve your learning, and this is especially true _______ it comes to standard tests.