input: Write a python function to make bulk API calls and upload results to Google Cloud Storage.
  assert bulk_api_calls(['https://jsonplaceholder.typicode.com/posts/1', 'https://jsonplaceholder.typicode.com/posts/2']) is not None
  assert bulk_api_calls(['https://jsonplaceholder.typicode.com/posts/3', 'https://jsonplaceholder.typicode.com/posts/4']) is not None
output: import requests
  from google.cloud import storage
  
  def bulk_api_calls(urls):
      results = []
      
      for url in urls:
          response = requests.get(url)
          if response.status_code == 200:
              results.append(response.json())
          else:
              results.append(None)
      
      client = storage.Client()
      bucket = client.bucket('your-bucket-name')
      blob = bucket.blob('api_results.json')
      blob.upload_from_string(json.dumps(results), content_type='application/json')
      
      return results