David_______ all night in order to watch the football match between France and Italy.

Do you know Earth Day?－Sure, it _______ in 1970 to tell us to protect our earth.

Our teacher is good ______singing English songs.[ ]

From May 6, pedestrians(行人) 10 yuan if they run red lights, according to Beijing traffic authorities.

I’d like to introduce my best friend to you , Peter .—- Thank you , Lucy . But we __________already .