用is，are，it's或they 're填空，完成句子
【小题1】─How much _________ this hat？
─_________five dollars.
【小题2】─How much _________ that T-shirt？
─_________ ten dollars.
【小题3】─How much _________these blue socks？
─_________two dollars.
【小题4】─How much _________ those white trousers？
─_________ fifteen dollars.
【小题5】─How much _________Lily's schoolbag？
─_________ ten dollars.
【小题6】─How much _________ those sweaters？
─_________ thirteen dollars.