2.If you work with a strong will，you will overcome any difficulty，　　great it is.

解析：此为however/no matter how引导的让步状语从句。句意：如果你有坚定的信念，不管困难多大，你都将会克服它。

答案：however/no matter how

1.Mr.Smith has learned some Chinese　　he came to Shenzhen.

解析：此为since引导的时间状语从句。since“自从”，从句的时态若是一般过去时，相应地主句中的时态是现在完成时或现在完成进行时。句意：自从史密斯先生来到深圳，他已经学了一些中文。

答案：since

24.The students are talking about the strange people and stories　　they met in the adventure.

解析：当先行词既有人又有物时，用that。

答案：that

23.On my birthday I got a watch from my uncle，　　was made in Japan.

解析：先行词是物a watch，从句缺少主语，句子中有逗号隔开，为非限制性定语从句，故用which。

答案：which

22.The day will come　　the people all over the world will win liberation.

解析：定语从句中不缺主语，也不缺宾语，表示时间，用关系副词when(＝on which)。

答案：when

21.I attended the meeting last month，　　lots of people talked about the recently­discovered star.

解析：定语从句中不缺主语，也不缺宾语，表示地点，用关系副词where(＝at which)。

答案：where

20.I，　　am your best friend，will help you out.

解析：先行词是人，从句缺主语，用who。

答案：who

18.Her parents wouldn't let her marry anyone　　family was very poor.

解析：先行词在从句中作定语修饰family，whose family在从句中作主语。

答案：whose

you think of other ways　　we can solve this problem？

解析：当先行词是way意为“方式、方法”且在定语从句中作状语时，引导定语从句的关系词有下列三种形式：the way in which/that/不填。

答案：in which/that/不填

17.I don't think the reason　　he explained at the meeting was reasonable.

解析：定语从句中he explained缺少宾语，用which，that或不填均可。

答案：that/which/不填

16.Is this the reason　　he is late again？

解析：定语从句中不缺主语，也不缺宾语，表示原因，用关系副词why(＝for which)。

答案：why