摘要： This is the best film which I have ever seen.
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下列句子中，每句都有一个错误，请找出错误之处并改正。
1. The price in this city is very expensive. ______
2. We must do all we could help those who are in difficulty.______
3. This is the river which I used to swim when I was a student.______
4. This is one of the best film I have ever seen.______
5. China now can produce the fastest computer of modern time.______
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2. We must do all we could help those who are in difficulty.______
3. This is the river which I used to swim when I was a student.______
4. This is one of the best film I have ever seen.______
5. China now can produce the fastest computer of modern time.______