用所给词的适当形式填空。
【小题1】Her mother is Chinese and her father is ________（Canada）.
【小题2】The ________（wound）birds finally fluttered to the ground.
【小题3】What do you think is the greatest ________（invent）of the twentieth century?
【小题4】Elephants are ________（use）for the farmers in Thailand.
【小题5】Uncle Black left quickly without ________（say）any word.