英语：根据句意写出单词的正确形式

英语：根据句意写出单词的正确形式1.It's hard but helpful to learn a foreigh __________(galanueg)2.Mr Wilson likes to ________ (viel)in China.3.Andrew knows much about __________(najap) because he lives in Tokyo for ten years 4.Sam is a businessman.He often flies to different _________(cutonreis).5.Many people in (gainsproe) can speak Chinese and Eglish.