Intro to sentence combining

Class Clown
1a) Chuckie bounces wildly in his desk.
1b) He is the class clown.
1c) He clucks like a chicken.

2a) His fingers make sounds.
2b) The sounds are scratching.
2c) They claw the desktop.
2d) The desktop is battered.

3a) Then a voice freezes his behavior.
3b) The voice is stern.
3c) The behavior is disturbing.

4a) He spins around.
4b) He raises his eyebrows.
4c) He asks, "Who me?"

5a) His teacher appears unamused.
5b) His teacher is a woman.
5c) She is very quiet.
5d) She has karate experience.

6a) She advances down the aisle.
6b) Her advance is slow.
6c) Her advance is quiet.
6d) Her advance is scary.