帮忙看下首字母填空.

帮忙看下首字母填空.
1)Usually,a person thinks of his diary as a book f( ) of secrets.Hedoes not want to s( ).But in the blog,anyone can read what he writes.
2)It is easy to hurt others' feelings in a vlog b( ) we do not always think about things carefully before we write about our days.So we have to be very c( )about what we write.