Используйте один в смысл во всех этих предложениях.
ПРИМЕР : We should do our duty. — One should do one’s duty.
1. If it’s necessary, you can always use a dictionary.
2. You can’t always get what you want.
3. We should wash ourselves regularly.
4. You shouldn’t expect all people to like you.
5. We live only once.
6. We have to learn to do a lot of things ourselves.
7. You never forgive a friend who lets you down.