给括号中的单词添加一个字母,成为新单词,并使句意完整

给括号中的单词添加一个字母,成为新单词,并使句意完整
1,l'm in class one ,grade【 】【to】
2,what does this sign mean?sorry,l don‘t【 】【now】
3,here’s a card【 】【or】you.
4,【 】【hen】is your birthday?lt's on the 19th of october
5,come and【 】【it】next to me