The theme of Thanksgiving has always been ______.

单项选择题The English Civil War in the 17th century is also called ______.

单项选择题World War I broke out on June 28th, ______.

单项选择题In some languages like ______, pitch variations are meaning distinctive. Therefore they are called tone languages.

单项选择题What is the author's attitude to high-tech equipment

单项选择题What do you think the underlined phrase look the part in paragraph 7 means