1．It's ________ (use) advising her to change her mind, for she is too stubborn.
答案：useless It's useless doing sth. “做……是无用/无益的”。
2．The only thing ________ I can remember is the big fire.
答案：that 当先行词被the only修饰时，定语从句的关系代词只用that，不用which。
3．Be careful, or you will have your hands ________(hurt)．
答案：hurt 此处为固定句式“have＋宾语＋宾补”。hurt与your hands 之间是被动关系，所以填写hurt的过去分词形式。
4．________ is known to us, China is a ________ (develop) country in the world.
答案：As; developing 第一空引导非限制性定语从句，且在从句中作成分，指代主句内容，意为“这一点”，故填as，且首字母大写；第二空表示“正在发展中的”，因此填developing。
5．I was riding my bike in the street ________ a car knocked me down from behind.
答案：when 此处为固定句式“be doing ... when ...”。
