________, you need to give all you have and try your best. 

—What made ber so sad?    —______a good chance to go abroad. 

This is the only way that I can think of _______ the problem of water waste in urban areas.

On returning home, she found a note _______ to the door, _______ “Call in later.”

Knowing office rules, whether ______ or not, is always of great importance, especially for young job seekers.