=> 11. Matthew, who can speak four languages, applied for the job. (who -> đtqh chỉ người) 12. Rice, which is grown in many countries, is a staple food throughout much of the world. (which -> đtqh chỉ vật) 13. We enjoyed Mexico City, where we spent our vacation. (where -> đtqh chỉ nơi chốn)
