Good Riddles

Question: Would you rather enter a pool with a man eating shark, or a pool with ten electric eels?

Question: What grows when it eats, but dies when it drinks?

Question: I'm 10 years old my brothers half my age now I'm 100 years old how old is my brother now?

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?

Question: I run over fields and woods all day. Under the bed at night I sit not alone. My tongue hangs out, up and to the rear, awaiting to be filled in the morning.

What am I?