That is _______ American national flag.There ______ fifty stars on it. A.a ,is B.an ,are C.an ,is单项选择,这题怎么做

American cultural and socity(2) Black Americans have experienced great changes since they were brought to North America.Discuss the changes that you believe to be most important for blacks.What is the historical significance of the first African Amer Is that your bother No,______ _______ . Is that boy a student?Yes,_______ He hasn't _______ that he is wrong (that) Is that _______ football?Yes,it is.(they)填空 Is she free on that day?同义句转换：______ she _______ _______ on that day. Whose is than pen?的同义句_______ _______is that. 英语翻译that is the boy we _______ _________ _________. It is vital that the work _______ in time. This movie is not the same as that one.=This muvie is _______ _______ that one. 2.this tree is ten years old.that tree is ten years old,too.(改为同义句)this tree is _______ _______ _______ that tree . 英语翻译______ _______ in China is ______ than that _______ Europe and South Africa It seems that she is happy.(改为简单句）She seems ______ _______ _______. 英语翻译The weather in Bejing in winter is not______ _______ _______ that in Harbin 根据所给汉语填空.What _______ _______ (究竟) is that? Is that the fish _______ _______ you asked the waiter?答案是for which吗? It is said that Yrtis are heavily built and full of hair.Yetis______ _______ _______ _______ heavily built and ______. hello!_______?this is tom.a.who is this b.who is that 为什么?