4. It’s ultimately scalable with a very small ecological footprint, ______ 24 hours a day, just like the Internet.
A. operating B. operate C. operated D. operates
5. It is not difficult to ________ the idea that machines may communicate information to us.
A. admit B. receive C. accept D. convince
6. People often discover their affinity to each other by the love ______ for a book.
A. they have each B. they each have
C. they has each D. they each has
