Which of the following words matches the sound /fi:l/

35.After they were given several terrible blows, the enemy did not _____ out after dark.

（2018·天津）Kae, _________sister I shared a room with when we were at college, has gone to work in Australia.

“Wechat”(微信) really makes a great _________ to people’s life. It’s easy for us to keep in touch with others.

________ do you call your mother’s sister in English— Aunt.