Rainforests _____ and burned at such a speed that they will disappear from the earth in the future.[ ]

A. cut      

B. are cut  

C. are being cut  

D. had been cut

— I hear the famous singer Xu Song may come to Ningbo next month.

— Really? _______ he comes, my younger sister will be very excited.

A．If

B．Until

C．Unless

D．Before