根据短文内容，用方框中所给词语的适当形式填空，使文章通顺，完整。（每词限用一次）

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Each year, thousands of Chinese middle school students go to study in foreign countries such as the U S, the UK, Australia and Japan.
"Chinese  hope very much to go abroad to get a wider view(视野) of the world," said Li Mingshan, a Chinese writer who has lived   America for many years. In a talk Li told more than 300 parents and their children that life in foreign countries can be  for young people. "They have to meet a culture shock and language problems.”
However, these are not the most difficult things. To most children, looking after when studying alone in a foreign country is a big challenge(挑战).
Zhao Baohua, a 16-year-old student   to study in a high school in Australia las t October. To his surprise, his teachers there hardly pushed students to study. And usually there wasn't homework. "With these education systems, we have more free   and more space for thinking," said Zhao. "But   you don't know how to plan your time and money, you will not have an easy time." Some of his friends spent their whole year's money in the first two months of the term, and they didn't   their exams.
"Studying abroad at a young age can help students learn foreign languages  , but students and parents should know about the challenges," Li said. "If you want to study abroad, try to talk to someone with experience in foreign countries. Make sure that you are   for it. "