Can you tell me when the plane _______ to Hong Kong this evening

By the time the girl comes back to life，scientists probably________a cure for this incurable disease.

When asked to explain ________ he does to make his students so fascinated with his lessons, the teacher paused and thought deeply.

She made as many men as she could _____her pain. [ ]

The famous basketballer, _______ tried to make a comeback, attracted a lot of attention.