1. — Have you seen _________ TV series Nirvana in Fire (《琅琊榜》), Mum?
— Yes, it’s quite _________ interesting play, so I have seen it twice.
A. a; the B. the; an C. a; a D. the; the
2. — Could you give me some advice on travelling?
— Take a map with you while travelling _____ you have a guide or you know the city very
well.
A. if B. unless C. although D. because
