The Difference Between “看(kàn)” and “看到(kàndào)”

Please choose the correct answer to fill in the blank. Andrew and his wife are waiting for his friends at the pier. Suddenly, he spots his friend Wang Wei.                 Wáng Wěi! Wǒmen zài zhèr, nǐ  kěyǐ  ____ wǒmen ma? Andrew: 王       伟! 我们      在 这儿,你 …