1. They have just sold that old house
-> That old house..
2. Despite wôrking hard, he can't support large family
-> Although...
3. If/it/not rain/tomorrow/I/go/camping/my friends
4. If/I/meet/alien/outer space/I/invite/home/talk
5. I/never/travelled/by/air
6.The students/study/for exam/now
7.It/be/such/cold day/we/decide/not/go out