In 2019, she was selected by the BBC as one of     1     of science in the 20th century along with Albert Einstein and Alan Mathison Turing. Tu Youyou     2     in being a scientist during a difficult time for science in China, her ability to use old wisdom and new methods to achieve her goals and the fact that her work     3    ,     4    .

In the UK and the US, senior high school students take part in v     1     (各种各样的) after-school activities, such as club activities and v     2     (志愿者) work. These activities not only help them gain more skills, but also teach them to care about others. After-school activities also play a part when students apply to college. However, they can take up a lot of time, so students have to learn to organise their busy s     3     (日程安排). To help them do this, some senior high schools offer courses in time management.

Cloning is the process of making an exact copy of a plant or animal and developing it either naturally or artificially. The first successfully cloned animal was a sheep    1    (name) Dolly in 1996. In January 2018, the two cloned long-tailed monkeys    2    (announce) by Chinese scientists. They were the first-ever primates,     3    proved to be much harder. The success has led to worldwide praise as a huge breakthrough.