请解决以下3道题

问题描述:

请解决以下3道题
What is dark but made by light?
what stays indoor no matter how many times you put it out?
which can movie faster,heat or cold

第一个是影子,第三个输错了吧第二个呢?还没想出来给你时间想第二个是光,第三个应该是heat