1 --Have you seen _____ umbrella here?
--You mean ___ black one? It was here a minute ago.
A an; the
B an; a
2 There are only 12 students in this classroom. Where are ___ ?
A the others
B others
3 About ___ of the workers in the factory were born in the ___ ?
A two-thirds; 1970
B two-thirds; 1970s
4 --Travelling by plane is ___ than travelling by train.
--Yes, but it is not so ___ as travelling by train.
A quickly; cheaper
B more quick; cheaply
C quick; more cheap
D qumker;cheap
5 While we were watching the play, ___ noticed a man with a funny look.
A usually
B suddenly
C quickly
D carefully
6 David jumped ___ in the long jump. He won the game!
A longest
B farthest
各位，请讲解一下，谢谢！