Circle the correct answers. 1. Marcos must / can't be sick. He never misses class, and he's absent today. 2. Dee could / can't be afraid of heights. She went ballooning last weekend. 3. Our teacher might / must be from Brazil. I'm not sure. She speaks Portuguese and Spanish. 4. We may not / can't be ready to go at 5:00. It depends on how fast we pack. 5. They can't/ must be tired. They went to bed at 2:00 a.m. and woke up at 6:00 a.m.!​