—________is a boat ticket for children?—How old is your child? It’s free for kids under three years old.

—Lily, how do you usually come to school every day?—Usually ______ bike.

It is a good habit (习惯) to read books        a pen in her hand.

---The artist has got _____ much work to do that he hardly has time to help his wife with the housework. ---That's true. Even on Sundays he is busy with his work. 

Taking ______ exercise and eating ______ food can make you keep thin.