C.Plants/water d.Carpet/Hoover e.cat/feed f.dinner/cook g.rubbish/take out h.windows/clean

C. The plants had been watered.
d. The carpet had been hoovered.
e. The cat had not been fed.
f. The dinner had not been cooked.
g. The rubbish had been taken out.
h. The windows had not been cleaned.