It never occurred to humans until the mid-l990s some animals can be cloned.
The family is a cooperative enterprise for which it is difficult to _____ rules, because each family needs to work out its own ways to deal with its own problems.
Keys should never be hidden around the house since thieves _____ know where to look.
The Department is also deeply _____ in various improvement schemes.
Although he doesn't like that law, he will _____ with it.