-Hello,Sandy.This is Jack.What are you doing?

-Hello,Sandy.This is Jack.What are you doing?
-I’m watching a match.It started at 7 p.m.and _____ on for another half an hour.
A.has been B.was C.had been x05D.will be
-Can you tell me how to make apple juice?
-Sure.Please watch carefully and you will see how it ______.
A.is made B.is making C.makes D.will make
-Mary dances best in our school.
-I agree.I’ll never forget ______ her dance for the first time.
A.seeing B.to see C.see D.seen