Look at that little boy wandering about — perhaps he _____ his mother.
Li Gang was required to apologize ________the people present at the meeting________what he had done.
—Have you heard that George quit his job? —Yeah, but I can't________why he did so.
—Tony, you must have noticed the student who broke the glass. —I'm sorry.I________attentively.
—Sorry for the delay.I got lost in the mountain. —That's OK.You're safe and that's what________.
—Tom has been fired by his boss. —________?As far as I know,he is a hardworking and considerate fellow.