Mr Li has some trouble sleeping, so dinking a glass of milk before going to bed every night is his common　　　　 ．

A．practice　　　 B．knowledge　 C．experience　 D．duty

Mr Li has some trouble sleeping, so dinking a glass of milk before going to bed every night is his common_____．

1. A.
   practice
2. B.
   knowledge
3. C.
   experience
4. D.
   duty

Mr Li has some trouble sleeping, so dinking a glass of milk before going to bed every night is his common         ．

       A．practice    B．knowledge       C．experience       D．duty

Mr Li has some trouble sleeping, so dinking a glass of milk before going to bed every night is his common_____．

       A．practice    B．knowledge       C．experience       D．duty

Mr Li has some trouble sleeping, so dinking a glass of milk before going to bed every night is his common         ．

         A．practice     B．knowledge          C．experience         D．duty