自“北美自由贸易协定”生效以来，美国对墨西哥的产品进口关税下降了84%，墨西哥对美国产品的进口关税只下降了43%，墨西哥在肉、奶制品、玉米等竞争力较弱的产品方面，有较长的过渡期，这体现出北美自由贸易区的特点是(　　)

    Charlie Chaplin was considered to be one of the most popular ____ (star) in the early days of films. He brightened the lives of people throughout the world ____ (use) his perfect acting.

    Charlie was born in a poor family and lived ____ hard life in his childhood. His parents were both poor hall performers,____ didn't make much money. Therefore, at a very young age, Charlie had to learn ____(sing) and dance. By his teens, his subtle acting had become so entertaining____ no one in England was ever bored watching him mime and act the fool doing ordinary everyday tasks. In 1972, he won a special Oscar ____ his outstanding work in the films that he wrote, directed, produced, and starred in. He made people laugh even when they felt depressed. And no one has done ____ (well) than him up to now.

    Charlie lived in England and the USA but ____(spend) his last years in Switzerland, where he died of ____ (nature) causes on December 25, 1977.