Fill in: both (of), neither (of), none (of) or all (of). deborah and carla are friends. they 1) like skiing and mountain-climbing but 2) them likes water sports, so they often go on winter holidays together. last winter, they went to switzerland with 3) their friends who like skiing and they 4) had a wonderful time. unfortunately, 5) their friends could stay for more than a week but 6) . . . deborah and carla are planning to go again this year. 7) them would miss it for the world!
