英语作业 06-05第一部分：语法填空5 / 共5页一、填空After the _ (two) World War there were many reports of mysterious (神秘的) flying saucers (飞碟). They _ (see) throughout the world. For quite a long time strange shapes had been reported in different parts of the world, but it was not _ recent times that they were _ (serious) studied. Pictures and films were taken of flying saucers, or UFOs seen in the sky. Some pilots of planes reported that round flying machines had followed them, moving at g
