－Mary, how did your Math test go?
－I had thought I _________, but in fact I came in the top 10% in my class.
| A．should have failed | B．couldn’t have failed |
C．might have failed | D．shouldn’t have failed |
Out of the crowded bus , who was dressed in a black suit and waved to a woman.
| A．a tall man in his thirties stepped | B．stepped a tall man in his thirties |
| C．did a tall man in his thirties step | D．did a tall man step in his thirties |
When exposed to stress, in ________ form, all of us react both chemically and physically.
| A．whichever | B．whatever | C．however | D．whenever |
After he was promoted to the present position, he is not so hardworking as he ______.
| A．was used to | B．used to be | C．was used to being | D．used to |
What actually ______ the accident has not yet been determined.
| A．brought out | B．brought on | C．brought about | D．brought up |
-- What were you up to when she dropped in?
-- I _____ for a while and _____ some reading.
| A．had played; was going to do | B．played; did |
| C．was playing; was going to do | D．had played; did |