5/ The stadium is very large. It can hold 60,000 people.
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6/ Those lessons are very difficult. He can't understand them.
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7/ She was very busy. She couldn't do the housework.
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8/ The clmate was very bad. All the plants couldn't grow well.
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9/ I'm very tired. I couldn't keep my eyes open.
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10/ That boy is very lazy. He never does his homework.