________silk feels soft and cool, it’s difficult to be taken good care of.

utdoor training is an exercise , as we know, teenagers’ confidence can be built.

Modern science has given clear evidence ________ smoking can lead to many diseases.[ ]

I haven’t seen Tom for a long time. Is he ill?—_____. His teacher told me he was in hospital.

The purpose of the campaign is to raise thepublic’s_______ of the dangers of passive smoking