根据句子意思，用括号中所给的适当形式填空。 1. It's _____ (polite) to ask a lady about her age in western countries. 2. The story _____ (it) is interesting, but it's a little difficult for children. 3. Look!  The teenagers are making cards _____ (show) love for their mothers. 4. Anna doesn't like playing computer games. Sometimes she does it _____ (simple) to relax. 5. Zhang Jike, a 23-year-old player, won the gold medal in the ______ (man)singles of the World Table Tennis Championships last month. 6. In order to provide better services for foreigners during the 2nd Youth Olympic Games, lots of bus and taxi drivers are busy ____ (learn)English.