Fill in the blank with the correct spelling word: An (a)   is a substance that triggers an immune response.

Fill in the blank with the correct spelling word: The middle of the week is called (a)   .

Fill in the blank with the correct spelling word: The middle of a stream is referred to as (a)   .

Fill in the blank with the correct spelling word: The middle part of a section is called (a)   .

Fill in the blank with the correct spelling word: The middle of the night is known as (a)   .

Fill in the blank with the correct spelling word: The middle point of something is called (a)   .

Fill in the blank with the correct spelling word: A material that allows light to pass through but is not completely clear is (a)   .

Fill in the blank with the correct spelling word: Something that crosses the Atlantic Ocean is described as (a)   .

Fill in the blank with the correct spelling word: The middle of a continent is referred to as (a)   .