小题1:What’s wrong ( with you)
What’s the matter/trouble (with you)
What happened to you
What’s up
小题2:I’m sorry to hear that
That’s too bad
小题3:Did you look for it there
Did you ask the students nearby
小题4:Why not write a note for that
How/What about writing a note for that
小题5:You’re welcome
Not at all
It’s my pleasure