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When he reads a book, his habit is to make a mark _______ the meaning is unclear to him. A. there B. wherever C. the place D. in which 2. If you are travelling ______ the customs are totally different from your own, you may feel a cultural shock. A. in the place B. which C. in which D. where 3. 原因状语从句 原因状语从句表示主句中的某一动作或状态所发生的原因。引导这种从句 常用的连接词是：because, since, as, for, now that 及 considering等。 e.g. He didn’t come to school because he was ill. c.f. He might be ill, for he didn’t come to school. 表示“直接”原因。 表示“间接的推断”原因. 不可出现在句首。 Jenny was very sad over the loss of the photos she had shot at Canada, ______ this was a memory she especially treasured. A. as B. if C. when D. where 2. Some people believe that ______ oil is running out, the fate of the motor industry is uncertain. A. / B. though C. for D. since 4. 条件状语从句 条件状语从句表示主句中的某一动作或状态是在什么情况或条件下发生的。条件状语从句中通常用一般现在时表示将来。 条件状语从句由从属连词引导：if, unless | 
