With an appropriate unit noun:
(1)Part of the lake has been polluted. You can see the water is covered with a ____ of oil.
(2)Let me give you a ____ of advice.
film; piece
With an appropriate unit noun:
(1)Part of the lake has been polluted. You can see the water is covered with a ____ of oil.
(2)Let me give you a ____ of advice.
film; piece
