We have _________ some organizations tohelp the poor students in the western areas of China.

Taking care of babies is __________ practice for men in most European countries.

Mum, I can’t see any point in studying hard.-Come on, dear. Years of hard study will surely________ in your future career.[ ]

Mary was listening to music while she _________ to school.

Mr. Smith, I often hear people say DVD, but I never know what they really mean. Would you tell me what DVD ____?