1 Don't whistle until you are out of the wood. 

2 A man cannot whistle and drink at he same time. 

3 The hound whipped out at the whistle.

4 He gave a low long whistle of surprise.

5 The referee blew his whistle for full time.

6 A train sounded its whistle in the distance.

7 Please whistle up all the dogs quickly.

8 The ship whistle shrieked to leave.

9 The referee blew the final whistle.

10 The teacher blew a whistle to start the race.

11 His cheerful whistle dispelled her fears.

12 England scored again,(www.Sentencedict.com) but the whistle had gone and the goal was disallowed.

13 Startled by the sudden whistle of the train, the horse broke away.

14 The referee blew his whistle.

15 The conductor blew his whistle, and the tram stopped.

16 The whistle signalled the end of the match.

17 One can whistle down the brakes when something happened.

18 The kettle began to whistle.

19 You can hear a nightingale whistle at night.

20 The dog came to his whistle.

21 He gave a short blast on his whistle.

22 A guard was blowing his whistle.

23 Polly blinked and emitted a long, low whistle.

24 The train entered the tunnel with a shrill whistle.

25 They tried to whistle up some help.

26 The referee blew his whistle for half-time.

27 The headteacher blew three blasts on a whistle.

28 At the referee's whistle the players unpiled.

29 Larsson scored just minutes before the final whistle.

30 The whistle was inaudible to the human ear.