Hello，boys and girls! My name is Zhang Hanyun，and my English name is Selina Zhang. Kristy Zhang's Chinese name is also Zhang Hanyun．She is a singer（歌手）．But I'm a clerk at Mr. Cool's Clothes Store．
We have shorts in black and white for 3 dollars．We have shirts in blue，black and white．The blue shirts are 7 dollars．The black shirts are also 7 dollars．The white shirts are on sale for 4 dollars．For boys，we have white socks．A pair of white socks is only 1 dollar．We also sell black shoes for only 18 dollar's．Come and see for yourself at Mr. Cool's Clothes Store．
请根据短文内容完成后面各题。
1．You can't buy ________ at Mr. Cool's Clothes Store．
A．black shoes B．black shorts C．blue shirts D．black socks
2．Two white shirts and a pair of white socks are ________．
A．6 dollars B．8 dollars C．9 dollars D．14 dollars
3．You have 21 dollars，and you can buy ________ pairs of shorts．
A．3 B．7 C．8 D．6
4．Selina Zhang is a ________．
A．clerk B．teacher C．student D．singer
5．--Can you buy white shoes at Mr. Cool's Clothes Store?
-- ________．
A．Yes，we can B．No，we can't C．Yes，I am D．No，they aren't