3,Although they worked very hard, they got.... 

10,Although they took the raincoat, they got wet

13,Although John ran very fast, John came... 

14,Despite thinking carefully before working, they made... 

15,In spite of the fact that Ha Noi isn't the biggest city in Viet Nam, it is...  

16,Although I have known her for a long time, I can't understand her

18,Despite being disappointed with you,I will still... 

3.Inspite of working very hard, they got in stuck In solving the problem.

⇒Although they worked very hard, they got in stuck In solving the problem.

10.Despite taking the raincoat, they got wet.

⇒Although they took the raincoat, they got wet.

13.Despite running very fast, John came to class late yesterday.

⇒Although John runs very fast, he came to class late yesterday.

14.Though they thought carefully before working, they made a terrible mistake.

⇒Despite thinking carefully before working, they made a terrible mistake.

15.Although Ha noi isn't the biggest city in Vietnam, It is the heart of the country for thousands year.

⇒Despite not being the biggest city in Vietnam, It is the heart of the country for thousands year.

16.Inspite of knowing her for a long time, I can't understand her.

⇒Athough I have known her for a long time, I can't understand her.

18.I will still wait for you although I am disappointed with you.

⇒I will still wait despite being disappointed with you.