Add a T and I shoot through the sky. Then add an S and I multiply. What word is it?

Answer: Come

More Difficult Riddles with answers

More Difficult Riddles

All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?
Although I'm not an insect, some people found me very difficult to exterminate. They called me something like 'insane priest.' The first half of my name means the same as 'scrape,' & my last three letters are a metal. Who am I?
Although my cow is dead, I still beat her. What a racket she makes!
Always old, sometimes new. Never sad, sometimes blue. Never empty, sometimes full. Never pushes, always pulls.
An alarm clock runs 4 minutes slow every hour. It was set right 3 1/2 hours ago. Now another clock which is correct shows noon. In how many minutes, to the nearest minutes, to the nearest minute, will the alarm clock show noon?
An eye in a blue face saw an eye in a green face. "That eye is like to this eye," Said the first eye, "But in low place not in a high place." What is it?
An item is made from lead blanks in a lathe shop. Each blank suffices for 1 item. Lead shavings accumulated for making 6 items can be melted and made into a blank. How many items can be made from 36 blanks?
An open ended barrel, it is shaped like a hive. It is filled with the flesh, and the flesh is alive!
As I traveled up and down our great glorious country, I found myself in a place where the tempature goes up sharply in the day and down at night. This had an effect on my watch, I noticed it was 1/2 a minute faster at nightfall, but at dawn it had lost 1/3 minute, making it only 1/6 minute fast. One morning- May 1- my watch showed the right time. By what date was it 5 minutes faster?
As I walked along the path I saw something with four fingers and one thumb, but it was not flesh, fish, bone or fowl.
At first I am a yellow weed in the lawn, and then the wind blows, and my white feathers are gone. What am I?
At first, I am nothing. Add something to negate. Add again to oppose. Add again to find the time to draw. Add once more to find nobody at all.