Определив функцию сложного герундиального оборота, переведите предложения

Our returning from the institute so late surprise them.

Our having returned so early surprised them.

Excuse my coming late.

He liked your asking questions.

They are glad at our professor's having published a new text-book.

He insisted on that student's being sent to the conference.

I know of a report being made every month.

Have you heard of control devices being used for controlling the manufacture of some industrial processes?

They know of the density of the substance having been determined some time ago.

Выделите герундий в функции подлежащего. Переведите предложения

Using a dictionary we can translate any technical article on our speciality.

Using symbols in mathematics is customary.

Solving such a problem is not an easy task.

Solving that problem he carried on a very serious scientific research.

Playing chess we did not notice when he came in.

Playing chess is his favourite occupation.

Walking, riding, flying, dancing and sailing are familiar examples of motion.

Knowing the physical properties of all the substances is very important to the chemist.

Reading this article he looked up several words in a dictionary.

Reading aloud improves your pronunciation.