I:根据定语从句所缺的成分填上正确的介词。 1.I’ll never forget the day ____ which I first met him. 2.The boy pointed to the direction ___ which he would run. 3.The clever boy made a hole in the wall,____ which he could see what was happening inside the house. 4.The man _____ whom you talked is my friend. 5.I bought many books yesterday,three ____which are written by Lu Xun. 6. Don’t talk about the things____ which you are not sure. 7.That is the house____ which he lived ten years ago. 8.That is the reason ___ which he is leaving so soon. 9.His father works in a factory ____which radio parts are made. 10.As a boy, he was always making things,most ___ which were electric.