Michael's mom asked him to pick up a few things at the grocery store. For taco dinner, beans, cheese, and salsa. Which should a: be placed to correct the error in the sentence?
There is no error in the sentence.
In the given sentence, the error is with the word "a:". The correct word to use in this context would be "should". Hence, the sentence should be corrected as -
"Michael's mom asked him to pick up a few things at the grocery store. For taco dinner, beans, cheese, and salsa should be placed."