Some teenagers turn a deaf ear to their parents’ advice, _____ they know it does good to them

Does Helen have a brother— . But she has a sister.

Tourists are now coming to Ping’an village in large numbers, ___________ they would never have stopped, had it not been Mo Yan’s hometown.

What ________ is a basketball —- It is________.

____ ,I have never seen anyone who is as energetic as Barack Obama