I’ll never forget the holiday ______ we spent together.
| A．When | B．how | C．in which | D．that |
Unfortunately, the element Madam Curie devoted all her life her death.
| A．to caused | B．causing | C．to be caused | D．to causing |
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 |