1 . 这意味着一个年轻人必须迅速褪去身上的孩子气，开始肩负起成年人的责任。(shoulder)(汉译英)

2 . 在疾病爆发不久之后，全国各地被称为“最美逆行者”的医护人员舍小家为大家，主动投身到了这场没有硝烟的战场中。(volunteer) (汉译英)

3 . Directions: Fill in the blanks with phrases in their proper forms in the box. Each phrase can only be used once. Note that there is one phrase more than you need.

give away；involve ....in；sing the praise of；be relevant to take on；show up；leave behind；refer to

1. The only reason that he _________for his success yesterday was that he always worked hard.
2. By opening a novel, I can ________my burdens and enter a mysterious world where I’m a character.
3. We didn’t expect the professor _____________at the conference.
4. All the people who ___________the accident were questioned by the police.
5. It is generally believed that being an adult involves ___________more responsibilities.
6. On the day after his first performance in London, all the newspapers _______________the new young actor.
7. The millionaire ___________his collections for free, which amazed the whole world.

4 . ________________ (这些与祖辈生活在一起的留守儿童的数量 leave) currently estimated at 60 million nationwide. （根据汉语提示完成句子）