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 lut 2025 10:28
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I agree with Tim on both points.
25 lut 2025 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 lut 2025 06:37
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