We _____ talk loudly when we see the sign “Be quiet” on the wall.—Yes, you are right. We should be polite in public.

___ is known to all, China will be an _____ and powerful country in 20 or 30 years’time.

People often use plastics to ______ wood or metal.

What a lovely day, _________?

Mike oftenargues ______ his friend ______ small things, which makes all of usveryunhappy.