31,That old house has just been sold 

32,Although the weather was bad, they had a wonderful holiday 

33,A new mall will be built here

34,If he doesn't take these pills, he won't be better 

35,Although he works hard , he can't support his large family 

#học_giỏi 

$\text{⇒ Answer:}$

$\text{31. That old house has just been sold by them.}$

$\text{32. Although the weather was bad, they had a wonderful holiday.}$

$\text{33. A new mall will be built here.}$

$\text{34. If he does not take these pills, he won’t be better.}$

$\text{35. Although he works hard, he can’t support his large family.}$