input: Write a python function to count the frequency of words in a paragraph using the Counter class from collections.
  assert word_frequency("This is a sample sentence to try out the program.") == [('This', 1), ('is', 1), ('a', 1), ('sample', 1), ('sentence', 1), ('to', 1), ('try', 1), ('out', 1), ('the', 1), ('program.', 1)]
  assert word_frequency("Test the function with test data test data.") == [('test', 2), ('data', 2), ('Test', 1), ('the', 1), ('function', 1), ('with', 1)]
  assert word_frequency("Word frequency count test, word frequency count.") == [('Word', 1), ('frequency', 2), ('count', 2), ('test,', 1), ('word', 1), ('count.', 1)]
output: def word_frequency(paragraph):
      from collections import Counter
      words = paragraph.split()
      counter = Counter(words)
      return list(counter.items())