The reading can be derived from 付ける, a word you should have seen a few levels ago. If you know that word's reading you should be able to figure out this word's reading as well (and vice versa).
If you buy this computer now, you’ll get something thrown in, so it’s a deal.
Michael's t-shirts have a lot of salad dressing stains on them.
What’s that thing attached to your earlobe?