1.He (gave) me the book back, (thanking) for lending it to him and (saying) that he enjoyed it very much.
2. I (knoew) that he (had not read) it because most of the pages (were) still uncut.
3. He (kept) looking at her, wondering where he (had seen) her before.
4.I (put) the $10 note into one of my books; but next day it (took) me ages to find it because I ___(had forgotten) which book I (put) it into.