21£®—Thanks for helping me with this difficult maths problem.

   —____. That’s what a close friend should do.

      A£®Nothing serious.                                B£®All right  

       C£®Never mind                                      D£®Forget it.

22£®Rainforests _____ and burnt at such a speed that they will disappear from the earth in the near future .

       A£®were cut          B£®are  cut            C£®has been cut      D£®are being cut