____ is bad for your health.

A. Stay up late   B. Staying up late   C. To stay up late

______ is bad for your health.

1. A.
   Stay up late
2. B.
   Staying up late
3. C.
   To stay up late

It is bad for your health(健康)to ________.

[　　]

A．get up early　　　　B．stay up late　　　　C．stay up lately