一、根据句意及首字母或汉语提示完成句子
1．My home is far a from our school. It's about 10 kilometers.
2．The mother tiger had a b tiger the day before yesterday (前天)．
3．It's not polite (礼貌的) to s at the old people.
4．When a ________ (老鼠) runs across the street, everyone wants to kill it.
5．Chinese is a useful ________ (语言). So we must try to learn it well.
