1．Always be grateful to other people’s kindness and show your gratitude through the words that you speak. You will make further progress you express your gratitude in time.
if/once/when 解析：空处所在句的句意：如果/一旦/当你能及时表达你的感激之情(时)，你会取得更大进步。根据语境可知，设空处引导条件/时间状语从句，故填if/once/when。
2．In a talk at Tsinghua University in Beijing, Zuckerberg spoke Chinese for about 30 minutes. his Chinese was far from perfect, the students cheered his effort.
Though/Although/While 解析：后句句意：尽管他的汉语很不完美，但学生们为他的努力喝彩。由句意可知，设空处引导让步状语从句，表示“尽管”，故可用Though/Although/While引导。
3．I was touched that I couldn’t sleep the whole night, and thought about being a teacher in the future.
so 解析：考查副词。根据固定句型so...that...“如此……以至于……”可知，应用副词so。
4．People in Dali are very friendly and honest to you you are a foreigner or just a local.
whether 解析：句意：大理的人对你友好而真诚，无论你是外国人还是当地居民。whether...or...表示“无论是……还是……”，引导让步状语从句。
5．These young people are not suitable for such a simple job in an office they are adventurous and creative in nature.
because 解析：句意：这些年轻人不适合办公室里这么简单的工作，因为他们天生具有冒险精神并富有创造力。此处表示直接原因，故填because。
