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用所给单词的适当形式填空.
When the world __1__ the 21st century. the development in __2__ and technology will bring us many more new hopes and chances we've never __3__ before. People are hoping to have a peaceful and highly __4__ world. To catch up with the new development and to be __5__ in the new century. the younger
generation is __6__ to possess different kinds of knowledge and skills. such as the computer science and
the English language. __7__ one will be left behind. Young people should study even __8__ at school and __9__ themselves mentally and physically to __10__ the challenge of the new century.
