there _____a pen ,a ruler··········用is还是are?

there _____a pen ,a ruler··········用is还是are? This is a pen.（改为一般疑问句）_____ _____a pen there is a pen 对a 提问 Please write down your name _____a pen.A.by B.with C.in D.on 可以说There is a pen here吗 There is a pen.的问句 There is a pen and a pencil 还是There are a pen and a pencil _____a library in your classroom.A there is B there is't C Is there I don't have a pen _____a pencil A.and B.to C.or 选哪个呢,为什么? I_______buy a new pen because there there is no pen in my pencilcase. there is a pen in the pencilbox对a pen 划线提问对句中的a pen 划线提问啊 This is a pen,and ____is a pencil over there there _ a pen and abook A.is B.are There( ) a pen and a book on the tabie . there is a pen.对划线部分a pen提问一哈就忘记怎么说了 There is a pen in my pencil case改为I () a pen in my pencil case There is a pen on the desk.(对a pen 提问.)____________on the desk? ()3.There are some () on the table.A.pen B.pens C.a pen