下列各组词语，只有一个错别字的一项是(　　)

Of all my classmates, often goes to the Internet café to kill time.

_____ worries the doctor most was _______they could find the cause of the disease

.The idea of traveling abroadreally__________a lot of Chinese people. That’s why every year witnesses morepeople applying for passports.

Kathy and her sister are so alike.—I can’t tell one from ____.