Eight simple sentences, each with a blank, a little picture and two choices in a box: dog or dogs, bus or buses, ant or ants. The child writes the word that makes the sentence right.
This is singular and plural nouns in real sentences, which is exactly where the first grade standard wants them. Some sentences give a number (two, three), some use a word like some, and some hide the clue in the verb (the jets are, the bus is), so a child has to read the whole line.
The pictures are there as backup rather than the whole answer, and because it is black and white a child can color them in once the writing is done.