21.   He just furrowed his brow.

22.   He leaned against a table outside the team dressing room, his brow furrowed, his demeanor quieter than usual.

23.   He furrowed his brow.

24.   I furrow my brow but end up grinning.

25.   I furrowed my brow.

26.   Is their brow furrowed?

27.   Kasparov showed his distress in his facial expressions, clenching his jaw muscles, furrowing his brow.

28.   Kasparov looked uncomfortable almost throughout the game, squirming and furrowing his brow, holding his chin in his hands and staring bullet holes into the board.

29.   Key lawmakers furrow their brows when asked whether Project SLIM worked.

30.   Matt Duffy put down his green bottle of beer, furrowed his brow and pondered a moment.