1 . Our national hero Yue Fei promised to ______________ (投身于保卫) the country at a young age. (根据汉语提示完成句子)

2 . The non-profit organization is ________ ________ (致力于) providing the animals with better care. (根据汉语提示完成句子)

3 . 在那期间，尽管疾病让他承受巨大疼痛，他仍专心投入学习。
During that time, he ________________ his study when suffering from great pain caused by his disease.

4 . 只有认识到互相帮助的重要性，我们才能致力于构建和谐社会。
Only when we realize the importance of helping each other __________ we __________ __________ __________ __________ a harmonious society.

6 . At that time numerous doctors and nurses are ________ ________ ________ (全力抗击) the 2019-nCov and brought hope to infected patients. （根据汉语提示完成句子）

8 . He used to ______ his teaching when he was young.

A．devote to

B．be devoted to

C．devoting to

D．being devoted to

9 . 除非你完全专注于你的工作，不然你永远不会获得成功。
You will never gain success unless you ______ fully ______ ______ your work.