The Education Department says that school safety has set off alarm bells with frequent reports of

serious accidents______ students got injured or killed.

  A. after which    B. in which       C. by  which       D. for which

-- 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

What actually ______ the accident has not yet been determined.

  A. brought out    B. brought on     C. brought about     D. brought up   

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

When exposed to stress, in ________ form, all of us react both chemically and physically.

A. whichever     B. whatever      C. however       D. whenever

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

Unfortunately, the element Madam Curie devoted all her life              her death.

A. to caused        B. causing          C. to be caused       D. to causing

The new movie  _____to be one of the biggest money-makers of all time . 

   A. pretends      B  agrees       C. promises         D. declines

If _______ unsolved, this may lead to more serious problems.

A. making   B. remained      C. left    D. taking

Talking about buying cars, I prefer a car less than 100,000 yuan to _____ over the amount.

   A. this        B. it           C. that           D. one