Countable and uncountable nouns

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Across
  1. 3. I would like two .... of chocolate.
  2. 6. I had an amazing .... of luck this morning.
  3. 7. In the north there was heavy .... of rain.
Down
  1. 1. Look at the ladybird on that .... of grass.
  2. 2. I heard loud .... of thunder.
  3. 4. I need couple of .... of ham.
  4. 5. "Flashes of lightning, amazing view!"