根据句意选用方框中的短语填空。

good luck, get lost, in danger, kill...for, cut down, made of

People ________ many trees so animals are losing their home.
Red represents (代表) _________ in China.
It’s easy ________ in a strange city without a map.
People ________ whales _________ their skins and meat.
The doctor says that the boy is no longer __________.
Those skirts are ________ cotton.