1 . Virtual choir members record themselves while ______ (perform) alone on video. (所给词的适当形式填空)

2 . He wrote a letter _________________________(在信中他解释了发生的事情) in the accident. (根据汉语提示完成句子)

4 . 这个活动不仅仅拓展了我们的视野，而且让我们意识到保护环境的重要性。(汉译英)
________________________________________________________________________

6 . Finally，my hard work _________________(获得回报) and gave me great satisfaction. (根据汉语提示完成句子)

7 . ____________ (磨光) your shoes regularly to protect the leather. (根据汉语提示单词拼写)

8 . I don’t think he fully c____________ that she won’t be here to help him. (根据首字母单词拼写)

9 . We’re a group of artists who meet to discuss ideas and c____________ each other’s work. (根据首字母单词拼写)

10 . If any of these symptoms occur while you are taking the medicine, c____________ your doctor immediately. (根据首字母单词拼写)