29. The siren is supposed to sit on the rock combing her long ___________(gold) hair

and singing.

28.The Rhine is one of the main waterways of__________________(German).

27.We appreciate your __________________(understand) and cooperation.

26.A similar _____________(argue) may explain demands for shorter working hours.

25.The workers ________________(they) certainly think this is important.

24.Another important _______________(consider) is how much each worker

contributes to the product he is making.

23.This kind of _____________(free) cannot easily be given in the modern factory with its complicated(复杂的)machinery which must be used in a fixed way.

22.The police caught the thief without any________________(difficult).

21. I was sorry to learn of your uncle's ______________(die).

20.He will give away his vast fortune to spare the American _________________　

(govern) the burden(负担)of health care.