As a recent survey states, people can hardly enjoy a clear blue sky because of the high level of PM 2.5.
___ he will come or not is_____ worries us.
____ is known to us all that the old scientist , for ____ life was hard in the past, still works hard in his eighties.
.---I’ll ask the teacher about the attributive clause. I’m very puzzled about it ---That’s just ____ most of our classmates have doubt.
____ is obviously right is to give all children equal opportunities to develop their special gift.
--- I’d like to go to the movie with you, Dad. --- Sorry, my son. But only the grown-ups are _____ into the cinema.