That bag was very heavy. None of us could carry it

Sos
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4. That bag was very heavy. None of us could carry it.
5. The stadium is very large. It can hold 60,000 people.
6. Those lessons are very difficult. He can't understand them.
7. She was very busy. She couldn't do the housework.
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8. The climate was very bad. All the plants couldn't grow well.
9. I'm very tired. I couldn't keep my eyes open.