Why does matt's father give matt his watch in sign of the beaver?

It shows that he loves Matt. But also, it's to help him keep track of time, and when his family will be back.

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).

one is a red flower, and one is the sky when the sun sets.