3. I hope this exercise isn't boring though it is very long
4. He didn't come even though we tried to invite him to the party
5. I don't like catching fish myself although I like fish
6. We couldn't get tickets although we queued for an hour
7. All the cars stopped because there was a cow on the streets
Giải thích:
Though/even though/although + mệnh đề: mặc dù
Because + mệnh đề: bởi vì
