1．(2020·新高考全国卷Ⅰ)They kept their collection at home until it got too big or until they died, and then it was given to a museum.
2．(2020·全国卷Ⅲ) When/As he asked the villagers on the banks of the river where he could find the legendary (传奇的) artist, they smiled and pointed down the river.
3．(2019·全国卷Ⅱ)I work not because I have to, but because I want to.
4．(2019·天津卷改编)Tom is so independent that he never asks his parents' opinion unless he wants their support.
5．(2018·天津卷改编)Let's not pick these peaches until this weekend so that they get sweet enough to be eaten.
6．(2018·江苏卷改编)Unless you can sleep well, you will lose the ability to focus, plan and stay motivated after one or two nights.
7．(2018·北京卷)If we don't stop climate change, many animals and plants in the world will be gone.
8．(北京卷)Although/Though/While birds use their feathers for flight, some of their feathers are for other purposes.
9．(北京卷)If you don't understand something, you may research, study, and talk to other people until/till you figure it out.
10．(江苏卷改编)Located where the Belt meets the Road, Jiangsu will contribute more to the Belt and Road construction.
