It began to rain ______ I was walking in the park.

— What do you think of Lily? — She is a kind girl. She is _________ these children, and they like playing with her.

He is      to play basketball，so he is unhappy.

It isn’t like a duck to water to learn a foreign language, so you must study hard.

---I feel tired.---Why don’t you go to bed early for ___ nights?