I don't think the experiment is ___ failure, because it has provided us with ___valuable experience for our future tests．
A．不填; 不填 B．不填; a C． a; 不填 D．a; a
--The research on the new bird flu virus vaccine is challenging and demanding. Who do you think can do the job?
--________ my students have a try?
A. Should B. Shall C. Will D. May
--How much salt did you put in the soup?
--I’m sorry to say, ________. I forget.
A. no B. no one C. nothing D. none
________ the important documents were needed_______.
A. Where; finding B. What; found
C. When; to find D. When; to be found
We are waiting until the weather ________ a little.
A. takes up B. picks up C. turns up D. makes up
--He must have received a good education in his childhood, ________ he?
--________, he is polite and well-behaved and acts like a gentleman.
A. didn’t; Yes B. has; Yes C. has; No D. didn’t; No
