辨析 little ; a little , few 和 a few 17. Dave has _____ friends here, so he often stays at home by himself and feels lonely. 18. Don't worry. We still have _____ minutes to catch the bus. 19. Now teenagers have _____ time to do exercise because of too much homework. 20. Li Ping has learned French for five months, so she can speak _____ French now. 21. Remember to take a coat. It's ______ cold at night. ! A few B. a few C. little D. a little