He has made a lot of films,but _______ good ones.

Go and join in the party. Leave______ to me to do the washing-up.

 It is good manners to eat up_______is left in your plate.

Life in the 21st century is much better than_____ used to be.

 He is the most hard-working students in his class. That means he is more hard-working than_______ in his class.