选词填空。
a an
1.--What's this?
--It's ______apple.
2.--What' this?
--It's______red apple.
3. It's______big egg for you.
4. Look, that is______English book.
5.--Lily, I'll give you______orange coat.
--Thank you. But I like______ blue coat very much.
6. It's______umbrella under the tree.
, but it’s too 
. 
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