填空（每小题1分，共5分）
根据句意，用括号内所给词的适当形式填空。
Your father and ______ (I) are both policemen. They work in the same police station.
Follow me and have a look at these works of art. They are one of the ______ (art).
Kate is very ___________ (luck) enough to find the missing keys.
Mary dances very___________ (good). She wants to be a dancer in the future.
When you come to the zebra _______ (cross), look around and then go.