不明飞行物的英文缩写是_______。

She doesn’t play the piano, but she likes singing and dancing.—_____.[ ]

I wonder if I can board the plane with this return ticket. — There _____be no problem. Your ticket is valid until the end of this month. [ ]

He worked in a car factory for four years，______ he founded his own company in his hometown

What is your little brother like— _______________________. He enjoys telling jokes.