Answer:
1) The arrival of electricity <u><em>transformed</em></u> people's lives.
2) My brother is the <u><em>co-author</em></u> of a well-known book on psychology.
3) Elizabeth Taylor <u><em>co-starred</em></u> with Paul Newman in Cat on a Hot Tin Roof.
4) It is now possible to <u><em>transplant </em></u>a heart from a dead person to a living one.
5) The movers will <u><em>transport</em></u> thousands of pictures, charts and recordings to the library.
6) The <u><em>co-pilot</em></u> took over the plane's controls while the captain had a coffee and a sandwich.
The subject English doesn't have CAPS error.