When first __________ to the market, the computer software was not a success due to its complexity in operation.
A. introducing B. being introduced
C. introduced D. to be introduced
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
— I want someone to write the composition for me.
— No. As a student, you ________ depend on yourself.
A. shall B. will C. can D. may
— He should have been warned of the danger.
— ________, but he wouldn’t listen to me.
A. Yes, he shouldn’t B. So he should C. So was he D. So he was
When exposed to stress, in ________ form, all of us react both chemically and physically.
A. whichever B. whatever C. however D. whenever
