Easy clean riddles for teens with simple answers

One winter day, there was a man standing in the middle of someone's front yard. The person stayed there for several weeks without moving and the owner of the yard didn't mind. Eventually the man left. Who was the man?

I repeat only the last word you say. The more I repeat, the softer I got. I cannot be seen but can be heard. What am I?

Farmer Brown came to town with some watermelons. He sold half of them plus half a melon and found that he had one whole melon left. How many melons did he take to town?

There is bomb on top of a computer; around the computer are a hairbrush, keys, phone and a cup. When the explosion comes, what item destroyed first?

Feed me and I live, yet give me a drink and I die.

What is it that has hands, yet is unable to clap?

Sometimes I am loved, usually by the young. Other times I am dreaded, mostly by the old ones. I am hard to remember, also hard to forget. And yet if you do, You'll make someone upset. I occur every day everyone has to face me. Even if you don't want it to happen; embrace me. What am I?

What has roots as nobody sees, Is taller than trees, Up, up it goes And yet never grows?

I follow you all day long, But when the night or rain comes, I am all gone.

I may seem real yet I am not, Once you're gone I'm often forgot. Time here stretches and it shrinks, It all depends on how you think. I may be good, I may be bad, I may be the same as one you've had. What am I?