1. With perseverance

See also: persevering

• birdseed
• birdseed grass
• birdsong
• birdwatch
• birefringence
• birefringent
• bireme
• biretta
• biriani
• birken
• birl
• birle
• birling
• Birmingham
• Biro
• birr
• birretta
• birth
• birth canal
• birth certificate
• birth control
• birth control device
• birth control pill
• birth defect
• birth pangs