Coffee makers developed in the 19th century by British engineer Adrian Richardson are often recognized as some of the best in the world. By partnering with coffee experts, Richardson adjusted the design of a standard coffee maker, enlarging some of the machine's openings and shaping _______ to be more compact in overall size.
Which choice completes the text so that it conforms to the conventions of Standard English?
20/27
Click to copy your unique test URL. Return anytime using this link.