I made this low level bomb game for my low level after-school students. I have been teaching them from the mes-english.com curriculum and it has been working really well so far. It works on "a, an, or the" as well as the following key words.
the sun, the sky, the moon, a cloud, a mountain, a tree, a flower, a river, a lake, the beach, an island, a rainbow, a rock, grass
I hope it is helpful.