11.   The inspector kept close watch of their arms and equipments and clothing.

12.   They tend, however, to keep a closer watch on discharges which are potentially highly polluting or large in volume.

13.   Two plain-clothes police officers, acting as hotel security men, kept watch on him.

14.   The police arrived to keep watch on the mouth of the tunnel.

15.   Jose, as usual, had climbed a tree to keep watch.

16.   U.S. officials have been keeping close watch on the situation.

17.   A lone sentinel kept watch over the fort.

18.   We keep constant watch on planning proposals and fight those which will prove damaging for birds.

19.   At each review particular watch was kept for the development of inappropriate obsession with food or an excessive tendency to limit diet and reintroductions.