改正下面短文中的错误。对标有题号的每一行作出判断：如无错误，在答题卡该行右边横线上画一个勾（√），请在有错误的地方增加、删除或修改某个单词。
注意：1.每处错误及其修改均仅限一词；
2.原行没有错的不要改。
Dear Ms Smith,
I am secretary of the City Student Union (CSU). We were organizing an art1. _____
exhibition for high school students in city. 2. _____
This will be held on the 9^th of July3. _____
in the Exhibition Hall of Beihai. More than 1000 painting will be on show, 4. _____
but high school students and teachers from all the eight districts will come to the event. 5. _____
As you are very popularly with us Chinese high school students, 6. _____
we’d like to invite for you to the exhibition. 7. _____
We would be grateful when 8. _____
you could join them that day. 9. _____
Looking forward to hear from you soon. 10. _____
Yours,
Li Ming