用冠词a/an或Be动词(am/is/are)填空。
1.What’sthisinEnglish? It’s________pen.
2.Isthat_________orange? Noitisn’t.
3.Itis________ruler.
4.Thisis________key.
5.Frank________OK.
6.Eric andDave________goodfriends.
7.What_______these?
8.How________yourfather?
9.I________aboy.
10.You________good.
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