英语的一些小题目!高手进啊!从方框中选择恰当的词完成对话.词： a , an , is , you , this , a

英语的一些小题目!高手进啊!
从方框中选择恰当的词完成对话.
词： a , an , is , you , this , are , they , it's , these , you're
Meimei:Wow!What's this ?
Jane: ( 1 ) a watch .
Meimei: Oh.Thank ( 2 ).Jane .
Jane:( 3 ) welcome . Now open ( 4 ) box .
Meimei:OK.What ( 5 ) this ?
Jane:It's ( 6 ) book.
Meimei:Oh,thank you . Jane . And what are ( 7 )?
Jame: ( 8 ) are keys.
Meimei: Thanks! They( 9 ) new(新的).
Jane: Open this ,too!
Meimei:Oh,it's ( 10 ) eraser.