nomadic life
6 Although sticky rice is very tasty, it's hard to eat every day.

Although+S+V,S+V
7 Although they aren't Christian, the family still has the custom of giving present at Xmas.

Although+S+V,S+V
8 Although the weather was bad, the trip was enjoyable

Although+S+V,S+V
9 We have cooperated with each other since 5 years 
10 They have planted trees since 10 years 

Thì HTH
11 Mr Mai has taught English at Phan Boi Chau since 30 years

Thì HTHT
12 We have lived  Hanoi for 5 years

Thì HTHT