baa: "Baa Baa" noised the lamb to attract his mother's attention.
bah: "Bah! I'm tired of writing these sentences!"
bam: Johnny was daydreaming in outfield, when bam, seemingly out of nowhere the baseball landed at his feet.
bang: Bang, went the door as the gust of wind slammed it shut.
bawl: "Bawl!" exclaimed the man as he hit his thumb with the hammer.
beep: "Beep, Beep!" the driver honked her horn to warn the inattentive driver.
belch: After drinking too much soda the boy let out a great belch!
boing: Boing, went the spring as the pressure on it was released.
bong: Bong, bong, bong rang the bells calling people to the next church service.
bonk: The baseball bat made a loud bonk when it connected with the ball.
boo: John jumped when his younger sister leapt out from behind the door and shouted "Boo!"
bump: There was a loud bump when the boy fell into the door.
buzz: As the computer got hotter, you could hear the buzz of its fan trying to cool the CPU down.