Pay attention to the structure preposition + relative pronoun. Usually only two relative pronouns -which and whom-can be used in the Attributive Clause, with a preposition put before the clause. That can't be used. Look at the screen. Here are more examples on this kind of structure.

1.This is the reason for which he left his hometown. (=why)

2.I'll never forget the day on which we stayed together. (=when)

3.This is the girl from whom I learned the news.

4.The person to whom I spoke just now is the manager that I told you about.

5.I'll show you a store in which you may buy all that you need.(=where)

6.I don't like the way in which you laughed at her.(=that)

Now go on to do Exercise No. 2 on page 36, that is, to sort out the sentences.

5. Closing down by reading more on the attributive clause (in/ for/ with/ by＋which/ whom

In formal styles we often put a preposition before the relative pronouns which and whom

*The rate at which a material heats up depends on its chemical composition.

*In the novel by Peters, on which the film is based, the main