He fired the starter pistol to signal the start of the race.

The air compressor has broken down, so it needs to be sent for repair.

He pretended to have a conversation on the phone, making it look like he was really talking to someone.

He loves playing air guitar.

This air intake improves the efficiency of the engine.

He is improving his piano skills by playing etudes every day.

I set aside time for self-practice every day.

I study Japanese every day using a workbook.

He went outside through the airlock of the spaceship.

I made an off-air recording of last night's radio program.