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.