1.   They knitted their brows and started to grumble.

2.   But Sampras has, so far, refused to knit his brows over this particular predicament.

3.   Finally, Kathleen was free to do more than check her watch and knit her brow.

4.   He frowned and knitted his brow, as if angry all over again.

5.   He knit his brow, trying to read the lips.

6.   He nodded, knitting his brow.

7.   Hollywood, after a three-month revel in expensive triviality, knits its brow and dons its glasses to signal a renewed commitment to expensive importance.

8.   Ms. Ackerman knits her brow suspiciously.

9.   Kartono knitted his brow once more.

10.   She knitted her brows at seeing the suffering all the victims had gone through.