下列两个句子合并成一个含有定语从句的复合句！高一英语！学霸进

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6 I left some books on the table which are not there anymore.7 Our puter which we bought 2 months ago keeps crashing.8 I spoke to a police officer who was working on the reception desk.9 Jack's girlfriend is very intelligent, both of whose parents are teachers.10 The reason why he refused the invitation is not clear.11 I have just failed my driving test, which is a pity.其实更常说的是 It is a pity that I have just failed my driving test.但是这是主语从句了12 It's too hot in my flat, which makes it possible to sleep.13 The outdoor swimming pool where we often went as children has now been closed down.