Complete the sentences with the given words in their proper forms (用括号中多给单词的适当形式完成下列句子。每空格限填一词) :
1.To improve your writing skills, you'd better________a habit of reading. (development)
2.It is a very________book for language learners to improve. (use)
3.This heavy box________twenty kilograms. (weight)
4.He is always ready to help________(other)
5.Be________while getting off the train. The ground is wet. (carefully)
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