Укажите номера предложений, в которых инфинитив является подлежащим.

To enter data and commands into the computer we use input devices.
To make an experiment of this kind seems nearly impossible.
To request information from the computer and get it quickly is called real-time processing.
To send and receive exact copies of documents is the task of a telefax.
To send highly sensitive information via email or fax is unsafe.

К сожалению, у нас пока нет статистики ответов на данный вопрос, но мы работаем над этим.