句子改错
请从A、B、C中选出错误选项填在括号内，并将正确答案填写在横线上。
( )1.We tell,A to start at once，or,B we will miss,C the train.________
( )2.Books are made from,A paper and,B paper is mainly made from,C wood.________
( )3.The hill is so,A high that,B it is often covered of,C heavy snow in winter.________
( )4.When,A you are with trouble,B，I will help,C you.________
( )5.Mobile phones are,A very important in,B our every day,C life.________
1．A are told 2.A of 3.C with
4.B in trouble 5.C everyday