用冠词a/ an或Be动词（am / is / are ）填空。

用冠词a/ an或Be动词（am / is / are ）填空。
小题1:What’s this in English ? It’s ________ pen.
小题2:Is that _________ orange? No, it isn’t.
小题3:It is ________ ruler.
小题4:This is ________ key.
小题5:Frank ________ OK.
小题6:Eric and Dave________ good friends.
小题7:What _______ these?
小题8:How ________ your father?
小题9:I ________ a boy.
小题10:You ________ good.