Use a bit of/a piece of/a bunch of/a cloud of/a lump of with the italicized nouns in the following sentences. The first has been done for you as an example.

(i) My teacher gave me some advice. My teacher gave me a bit of advice.
(ii) Can you give me some clay, please. ------
(iii) The information you gave was very useful. ------
(iv) Because of these factories, smoke hangs over the city. ------
(v) Two stones rubbed together can produce sparks of fire. ------
(vi) He gave me some flowers on my birthday. ------

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(i) My teacher gave me some advice. My teacher gave me a bit of advice.
(ii) Can you give me some clay, please. Can you give me a lump of clay, please.
(iii) The information you gave was very useful.  The piece of information you gave was very useful.
(iv) Because of these factories, smoke hangs over the city. Because of these factories, a cloud of smoke hangs over the city.
(v) Two stones rubbed together can produce sparks of fire. Two pieces of stones rubbed together can produce sparks of fire. 
(vi) He gave me some flowers on my birthday. He gave me a bunch of flowers on my birthday.