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در اینجا پاسخ‌های درست برای جاهای خالی هستند: 1. White blood cells defend body against diseases. 2. The sky is cloudy. We cannot see the moon tonight. 3. You need a powerful microscope to see something so small. 4. Daily exercise keeps us strong and healthy. 5. The Hubble telescope goes around Earth every 97 minutes.

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