_______man must fear when travelling in space is radiation from the sun.

She tried to_______laughing，but it didn’t work;the performer gave her an angry look at her.

The patient was warned _______ oily food after the operation. [ ]

Linda, you are good at swimming. Who taught you______—Nobody. I taught _______.

Presently, the old tend to take up some new hobbies ___________they can find a brand new definition of life