None of them are correct for 13. It should just be:
Attend your classes regularly.
Also, 16 doesn't really make much sense. Suitable words would be 'preparing' or 'readying', though the second one would be considered unusual.
25 февр. 2025 г., 10:28
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I agree with Tim on both points.
25 февр. 2025 г., 11:26
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I agree with Tim. If you have a choice, I think you should find a different book. This one appears to have a lot of errors.
26 февр. 2025 г., 6:37
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