【推荐1】It is ________ to keep others waiting in many western countries. (polite)

【推荐2】You should be ________ (politely) to the teachers.

【推荐3】My sister Sally is always _______ (有礼貌的) to others.

【推荐1】—It’s ________（残忍的）to make such a young boy work for 10 hours a day.
—Yes, I agree with you.

【推荐2】Swimming in the sea is very___________ (危险的).

【推荐3】Complete the sentences with the given words in their proper forms (用括号中所给单词的适当形式完成下列句子。每空格限填一词)
1. No one will believe a man who often tells ________. (lie)
2. This is my E-mail address, and may I have ________? (you)
3. Jack wants to be a newspaper________ when he grows up. (report)
4. China is very different from ________ countries in culture and customs. (west)
5. The People’s Republic of China will celebrate her ________ birthday this year. (seventy)
6. The old buildings in the city ________ quite a few foreigners every year. (attractive)
7. It is ________ to understand every single word when reading an article. (necessary)
8. Although similar in appearance, the twins are ________ different in character. (complete)