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1. The concurrent.futures.ThreadPoolExecutor class provides us:

   1. A high-level interface for synchronously executing callables.

   2. A high-level interface for asynchronously executing callables.

   3. A high-level interface for composing HTTP requests.

2. The @tornado.concurrent.run_on_executor decorator allows us to:

   1. Run an asynchronous method synchronously on an executor.

   2. Run an asynchronous method on an executor without generating a Future.

   3. Run a synchronous method asynchronously on an executor.

3. The recommended way to write asynchronous code in Tornado is to use:

   1. Coroutines.

   2. Chained callbacks.

   3. Subroutines.

4. The tornado.Testing.AsyncHTTPTestCase class represents:

   1. A test case that starts up a Flask HTTP Server.

   2. A test case that starts up a Tornado HTTP Server.

   3. A test case that doesn't start up any HTTP Server.

5. If we want to convert the bytes in a JSON response body to a Python dictionary, we can use the following function:

   1. tornado.escape.json_decode

   2. tornado.escape.byte_decode

   3. tornado.escape...