You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

Fate has decided that you will only be pleased to meet me when you need me

Maybe that is why, when I am working, I start working

However annoying I may be to the regulars, the little ones are always inspired

I will always be waiting if you try to reach me

How many of you can guess my name, let me see

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

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

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

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

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

Lifeless eyes on my smiling face and watch your child's sleeping place. In their dreams they hold me tight. What am I?