Good Riddles

Question: I have 3 eye colors yellow red and green when the red eye opens everybody freezes. What am I?

Question: Made of ten but two we are havoc 5 and we are weak but all together but small we are strong.

Question: what government agency is also a possessive pronoun?

Question: Time belongs to men twice a day - what time is it?

Question: A pond with dimension of 6m by 3m wil be filled of water lilies at exactly 30 days. Each day the number of water lilies will be doubled. First day 1, second day 2 etc... On what day it will fill half of the pond?