同义句转换。 1. To learn English well is very important. _____ _____ very important _____ learn English well. 2. Kate began to study Chinese in 2004. It _____ _____ over two years since she began to study Chinese. 3.'Are there homeless people in your city?' I asked Wang Tao. I asked Wang Tao _____ there _____ homeless people in his city. 4. Millions of people speak English as their second language. English _____ _____ by millions of people as their second language. 5. He doesn't know where he can find a pen pal. He doesn't know _____ _____ find a pen pal.