1 . After he retired，the old couple went to Beihai，bought a second-hand house and s________ down there. (根据首字母单词拼写)

2 . She __________ (足够幸运找到一份工作) as soon as she graduated from college. (根据汉语提示完成句子)

3 . Biologists _________ (observe) a significant increase in bird species diversity after reforestation efforts. (所给词的适当形式填空)

4 . 我匆忙赶到王教授家，可是却发现他外出了。
I hurried to Professor Wang’s house, ___________________.

5 . 他花了很长时间才获得成为一名优秀舞者所需要的技能。(It takes sb. some time to do sth.)
____________________ he needed to become a good dancer.

6 . “They will know when I’ve finished,” ______________________(传来了回答). (根据汉语提示完成句子)

7 . At the beginning of the composition class, the teacher ________ (布置) his students a topic for them to discuss first. (根据汉语提示单词拼写)

10 . One of my friends told me a story while we_____(聊天) online. (根据汉语提示单词拼写)