Using _____ illegal drugs can lead to health problems, and it can be _____ stain on one’s life.
| A．不填；the | B．the; the | C．the; a | D．不填； a |
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 |
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 |
At school, it is essential that every child ______ equally regardless of family background.
| A．treating | B．treated | C．be treated | D．is treated |