Các dạng so sánh với tính từ và trạng từ: Do you have a cheaper computer than this? There are over eight hundred stamps in Tim's collection

1.Do you have a cheaper computer than this?
=>Is this.......................................................................
2.There are over eight hundred stamps in Tim's collection
=>Tim's collection....................................................................
3.She doesn't have as many stamps as I do
=>She has.........................................................................
=>I have............................................................................
4.There is less coffee in my cup than there is in yours
=>There is not....................................................................