I think it’s necessary for us English well.
---You bought the car ten years ago? ---Yes. ______ it’s old, it still runs well.
---Relax. Don’t work today. Just ______. ---Thanks a lot.
I don’t think one country can solve the problem of pollution alone, _______?
--- Have you finished all your homework?--- Of course. I ______ it before I went out to play football.
Shangri-la, a place of mystery and beauty, is indeed a heavenly world ______ people live in.