Sight Words are words which occur frequently during reading and which often cannot be sounded out.  I would suggest putting them in a ziplock bag marked "I don't know."  As your child learns each word they can then put the words into a bag that says "I know". This will keep it fun for your child while they learn the sight words!
Here some other ideas for review:
*Have the child trace the word each time it is written.
*Write the words in sand or salt sprinkled in a container such as a shoe box lid.
*Have the child construct the word with magnetic letters.
*Play a Memory Game with the sight word cards. Place the cards face down on a table and try to match pairs.
*Use a dry erase board and have the child write the word out.