Вопрос по английскому языку:

№7. Выберите подходящий вариант из предложенных:
1. I tried to open/opening the window, but it was too high to rich.
2. I tried to open/opening the window, but it was still too hot in the room.
3. I‟ll never forget to give/giving my first presentation to the Board.
4. Don‟t forget to look at/looking at the audience when you speak.
5. We regret to announce/announcing the death of our founder, Mr. Obuchi.
6. I regret to quit/quitting my MBA course.
7. The new product is doing really well. I think we should go on to sell/selling it for another six months at least.
8. First I‟ll say a little about the history of the company, then I‟ll go on to describe/describing our new range of products.