Even if the treatment _____, there’s still no magic pill for patients in the late stage of AIDS.

(2013·湖北高考)In much of the animal world, night is the time ________ for sleep —pure and simple.

 The long­expected match was ________ at half­time because of the poor weather conditions.

 Although the living standards of Chinese people have greatly improved, most poor families in China spend      50% of their income on food.

The ________ of school leavers that go to university is about fifty percent.