I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

What is the riddle which can be asked all day with a different correct answer each time.

Do You See It?

I know a nine-letter word having only one vowel.
Do you ?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

During which month do people sleep the least?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

If six children and two dogs were under an umbrella, how come none of them got wet?

It is an eleven letter word.
The first, second, third and fourth letters form a banquet's name.
The fifth, sixth and seventh letters form a car's name.
The eighth, ninth, tenth and eleventh letters form a mode of transport.

Can you identify what word it is?

How can you write nineteen in a manner that if we take out one, it becomes twenty?