Boys in early adolescence are not _________ to the cinema because the film is not suitable for them.

Three years ago，a society was set up to________the endangered animal and plant life from dying out in this area.

Many dog owners treat their pets like human beings, ________ if they do not have children of their own.

—How can I use the equipment?—Well, just refer to the ________.

The accident has _____________to be a good thing after all．