1 . His friendliness and kindness gave us a strong ________. In other words, we were all ________ by his friendliness and kindness.(impress) (用所给词的适当形式填空)

2 . China, an ancient country of over 5, 000 years of history and cultural tradition, has a profound ________(tradition) cultural foundation. (用所给词的适当形式填空)

3 . Fish­keeping is a widespread hobby and the keeper can ________ (观察) their behaviour in the glass tank and study its entire life cycle. (根据汉语提示单词拼写)

4 . And it came to me then how much easier it would be if we had ______ range of words that express different grades of gratitude (感谢).

5 . Science works with concepts of averages which are far too general to do justice ______ the subjective variety of an individual life. (用适当的词填空)

6 . Seeing the falling plane, painful memories of terrorist attack on Sept. 11, 2001 ______ (闪过) across his mind. (根据汉语提示单词拼写)

7 . ____________ (claim) so many precious lives, COVID-19 serves as a constant reminder that countries must rise above differences in geography, race, history, culture and social system. (所给词的适当形式填空)

8 . We need to keep pushing the __________ (界限) instead of being satisfied with ourselves whenever we achieve a small step along the journey. (根据汉语提示单词拼写)

9 . Metals, plastic and cloth are all r________ materials which can greatly reduce the energy used to produce new ones. (根据首字母单词拼写)

10 . Human beings are taking advantage of r________ materials like paper and metals in order to reduce waste and save energy. (根据首字母单词拼写)