The Kings have been in Beijing for three years, so they are familiar ____ the city. [ ]

Justin Bieber has many good songs. They are_______ with young people.

Scientists say it may be five or six years _____ it is possible to test this medicine to human patients.

The boy is so happy that he sings along _____ the music and dances _____it. [ ]

They had _______ wonderful train ride to Chengdu before they went on to _______ Mount Emei by bus.