We need clear air and water, so we _____ protect the environment.

There___________ football matches on CCTV5 this evening, aren’t there—Yes, my father and I will watch them.

Chinese is becoming more and more popular.It ________ in many schools in foreign countries.

His uncle went abroad in 2010, and_____ since.[ ]

s the small house less than 20 square meters,under ______Roof lives a large family of three generations.