5/ The stadium is very large. It can hold 60,000 people.

=> The stadium is so very large that it can hold 60 000 people.

6/ Those lessons are very difficult. He can't understand them.

=> Those lessons are so very difficult that he can't understand them.

7/ She was very busy. She couldn't do the housework.

=> She was so very busy that she couldn't do the housework.

8/ The clmate was very bad. All the plants couldn't grow well.

=> The climate was so very bad that all the plants couldn't grow well.

9/ I'm very tired. I couldn't keep my eyes open.

=> I'm so very tired that I couldn't keep my eyes open.

10/ That boy is very lazy. He never does his homework.

=> That boy is so very lazy that he never does his homework.