Possible sentiments for "Stuck".

#1 - "Sorry. I was stuck..."

#2 - "Excuses, excuses, excuses..."

#3 - "There's nothing to be said for overdevelopment..."

#4 - "That's Life."

#5 - "I like driving you crazy..."

And, of course, the standards:
#A - Get Well
#B - Happy Birthday
#C - Bon Voyage
#D - Thinking of You
#E - Thank You
#F - Miss You
#G - Good Luck
#H - Good Bye
#J - Sorry
#K - With Sympathy
#L - Keep in Touch
#M - Be Well