input: Write a function to convert a list of integers into a dictionary where the keys are the integers from the list and the values are their corresponding words in English. If the input list is empty, return an empty dictionary.
  assert convert_to_dict([1, 2, 3, 4])=={1: 'one', 2: 'two', 3: 'three', 4: 'four'}
  assert convert_to_dict([])=={}
output: def convert_to_dict(lst):
      num_to_word = {1: 'one', 2: 'two', 3: 'three', 4: 'four', 5: 'five', 6: 'six', 7: 'seven', 8: 'eight', 9: 'nine'}
      return {num: num_to_word.get(num, '') for num in lst}