从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
21．—What has Tom been doing recently?
—I don’t know. care.
A．nor I do B．nor do I C．neither am I D．neither I am
22．How does it that he is so badly-off when he earns quite a good salary?
A．come out B．come about C．come up D．come along
