A low-carbon lifestyle is of great benefit to improve_____ world environment. Nothing can be enjoyed from it until you have____ deep understanding of it, though.
While protests have removed the president from his position, the country has been suffering a sharp _____ in its economy.
Sustainable living is ____ lifestyle that attempts to reduce _____ society’s use of the natural resources.
–Are you tired? -- _______. I can’t walk on a step farther and I am dying for some water.
---How was your trip to Sichuan? ---Wonderful! I’ve never had _____ one before.
The boy _______ in the bed ______to his friend that a cock ______an egg yesterday.