（A）clock and（an）English book are on the computer desk.为什么要用A和an?

（A）clock and（an）English book are on the computer desk.为什么要用A和an? this is an a（ ） clock 如何填空? A clock has no feet ___legs.A clock has no eyes___no ears A.or and B a and C or or D and an And she told me that the reason was that there was an alarm clock in my mind.(同义句）And told me that _____ _____ _____ there was an alarm clock in my mind. 改错An alarm clock and a pen are on the desk . There is a clock and some pictures on the wall.(改为同义句） ----aunt and -----uncle（an,a） 对划线部分提问 1.James is fine.____ _____James?2.That's a phone._____ _____that?3.Her phone number is 929-31._____ ______her phone number?(以上每空一个单词）根据句意及首字母的提示,完成单词拼写.L________!That's an Engl 英语题目（7A）翻译：1.他每天早晨花半小时读英语.2.我父亲每天花15分钟步行上班.3.放学后我们经常练习踢足球.二.1.I want some water and a cake.(同义句）三.They often ______in class.A.practise speaking Engl I have（ ）uncle and （ ） aunt.A.an,an B.a,a C.a,an D.an,a go off 的同义词句子是：I'll set an alarm clock to go off a few minutes early and put the clock by the telephone. I can see a book on the desk,a clock（）the book and a pen（）the book Ben`s bag is yellow and red.（对打引号的部分提问）________ _________is Ben`s dag?英语Ben`s bag is yellow and red.（对打引号的部分提问） ________ _________is Ben`s dag? My Engl _______ clock and a pen __________ on the desk.A.An,is B.A,is B.A,are D.An,are A Clock and a WatchWe can tell time by a clock or by a watch. A clock is big; it is usually on the wall or on the table. A watch is small; we can put it in the pocket（衣袋）or wear it on the wrist（手腕）! A clock or a watch usually has a ro It was about 600 years ago that the first clock with a face and an hour hand was made. It was about 600 years ago____the first clock with a face and an hour hand was made. It was about 600 years ago_______the first clock with a face and an hour hand was made.填什么?