input: Write a function to combine the elements of two lists into a list of tuples.
  assert combine_list([1, 2, 3], [4, 5, 6])==[(1, 4), (2, 5), (3, 6)]
  assert combine_list([7, 8, 9], [10, 11, 12])==[(7, 10), (8, 11), (9, 12)]
  assert combine_list([], [])==[]
  assert combine_list([1], [2])==[(1, 2)]
  assert combine_list([1, 2], [3, 4, 5])==[(1, 3), (2, 4)]
output: def combine_list(list1, list2):
      return list(zip(list1, list2))