用所给词的适当形式填空。（5分）

小题1:The radio says it will be much________(wind) tomorrow. That is to say there will be much _______(wind).

小题2:He kept his worries to himself instead of ___________(tell) others.

小题3:We should take action ____________(protect) wild animals.

小题4:Physics __________(be) my favourite subject. I can learn a lot about science.

一般较成熟的DSS结构是由（）、（）和（）构成。