Sentence:  ‘No,' said Luke, grinning at her. ‘You're not dull enough! […] What about the kid's clothes? I don't <WSD>suppose</WSD> they were anything to write home about, but didn't you keep anything? A bootee or a bit of embroidery or anything at all?' 
Meaning of the word marked with <WSD> tags:  To take for granted; to conclude, with less than absolute supporting data; to believe.