据意填词&根据所给词适当形式填空

据意填词&根据所给词适当形式填空
1.Dogs can help us ( ) (find) ( ) (lose) people.
2.He stops at the ( )(cross) because of the red light.
3.Is it ( ) to cross the road now? Yes , there’s the grern man.You can cross the road( ).You are in ( ) when the green light on.(safe)
4.People have ( )(keep) dogs for ( ) (million ) of years.