为什么the 50th anniversary of the founding of our school中要用个the founding of

为什么the 50th anniversary of the founding of our school中要用个the founding of 初中英语in the 18th and 19th centuryin the 18th and 19th century（century要变为复数centuries吗?为什么?） th registration fees为什么不是the fees of regiistration It was Friday,the 12th yesterday.就Friday,the 12th 原题是这样的 It was Friday,the 12th yesterday.(Friday,the 12th都画线）______ _______ yesterday?为什么只有两空呢？ At the 27th her husband was taken to hospital during th night.在晚上为什么用during th night,而不是at the night on the morning of the 16th of April 这里为什么不用介词in The Elements of Style:50th Anniversary Edition是什么书 On the 50th wedding anniversary of mom and daddy In 1983,a huge ape model was put on the Empire State Building for the movie King Kong's（ )birthday A.30th B.50th C.40th D.100th in the morning of July 16th 这句话为什么用in 是不是因为有of? Make the door be closed 和 Make th door is closed. 哪个对? 为什么? 改错：In the evening of 24^th December, we always have a Christmas party.为什么？ the school trip is (on)June 2th为什么不要加?书上也没加! HE does not like living on the 10th floor.为什么用living on The 15th day of the 8th lunar month Sue is both the 50th best and 50th worst student at school,how many students? THE 19TH WIFE怎么样