1．(2019·河南中原名校联考)I have made a habit of saying“Thank you” to those
offer their seats to the fellow passengers on public transport.
who 解析：句意：我已经习惯对那些在公共交通工具上把座位让给同车的乘客的人说声“谢谢”。设空处引导定语从句，先行词为those，指人，且关系词在从句中作主语，故填who。
2．(2019·山西晋商四校联考)Finally, after four hours, they arrived at the campsite
their parents were waiting.
where 解析：句意：最后，在4个小时之后他们到达了营地，他们的父母正在那里等着他们。先行词为campsite，将先行词代入定语从句后可知先行词在定语从句中作地点状语，故填where。
3．(2019·江西重点中学联盟联考)At Pets Corner, we have always tried to apply an honest and moral approach to everything we do.
that 解析：句意：在宠物角，我们总是试图去将一种诚实和道德的方法运用到我们做的所有事上。此处先行词为不定代词everything，且关系词在定语从句中作宾语，故用关系代词that。
4．(2019·潍坊实验中学模拟)At 16, I left home to do parttime jobs, made me understand “East or west, home is the best” better.
which 解析：第二个逗号后面为非限制性定语从句，引导词作主语且代替前面的整个句子，故用which引导。
