— I’d like to go to the cinema with you, Dad.— Sorry, my darling, but the film is ___________for adults only.

All possible means __________.However, nothing can __________ Jack from adventuring in that mysterious forest.

 The OPEC has recently cut back production and the price of oil has been ______ to $90 a barrel (桶).

The doctor said jokingly that his own infection of the virus _______ the discovery of a vaccine (疫苗)of the disease.

When I was in kindergarten, I was often _____ by my teachers to be polite to the adults.