1. What are the chances of these molecules springing spontaneously into existence?
2. The fuel spontaneously ignites because of the high temperature and pressure.
3. People used to believe that dirt spontaneously generated disease.
4. Opportunities for learning occur spontaneously every day.
5. As soon as the tremor passed, many people spontaneously arose and cheered.
6. We decided spontaneously to board a train for Geneva.
7. Usually a woman's breasts produce milk spontaneously after the birth.
8. Sometimes fun activities just happen spontaneously; at other times they take careful planning.
9. I had never been spontaneously approached by a publisher and such condescension rather turned my head.
10. The body becomes readily subject to bruising, sometimes spontaneously.
11. They love it when the pupils spontaneously show affection or appreciation.
12. Is it one of those reactions that occur spontaneously when journalists' ink is mixed with an equal measure of pure ignorance?
13. The members of the editorial group spontaneously agreed that the royalties should be devoted to spiritual and charitable purposes.
14. Would the hydra eventually wither away spontaneously?