Our special thanks to go thousands of volunteers, without ____tireless work, none of this would be possible

In such hot weather, the new plant will have to be protected from the sun if they ______.

What does the notice on the wall say — “No person _____ take books out of thereading room; otherwise he _____ be fined”

While working outdoors，Linda was________by the heat and fell to the ground，unconscious

I can’t play _______ piano, but I play _______ football very well.