1. 下面哪个句子是正确的?
Which sentence is grammatically CORRECT?
2. 以下哪个句子里的"了"表示"变化/新情况"?
In which sentence does "了" express a CHANGE in situation?
3. 最近感冒的人______多了,大家都要注意。
Recently, more and more people are catching colds — everyone should be careful. Fill in the blank.