THREE RHYMING RIDDLES

1)
My first is in silly, but not in fool,
My second in pupil, but not in school.
My third in read and also write,
My fourth in glimpse and also light.
My fifth in ten but not in three,
My last in glad and also glee.

2)
What has wings but cannot fly,
Is enclosed, but can outside lie?
Plays host to both - farce and sublime,
Can pass an hour or transcend time?

3)
I fly through both day and night,
Mocking the swiftest bird in flight;
Reverse me and quickly I discharge,
Transpose me I'm a bug - indeed not large.

Answers:

1. SPRING 
2. A stage 
3. TIME, EMIT, MITE