Most birds find it safe to sleep in the trees, but ____ they have eggs or young chicks, they don’t use a nest

What do you think of this kind of TV set, which ＿＿ in Shanghai? — Well, I don’t care such things

Every possible means _____ to prevent the air pollution, but the sky is still not clear.

The thief was brought in, his hands ____________ behind his back [ ]

It is a paradox（自相矛盾） that ina rich country there should bemany poor people.