As a result of __ is now known in physics and chemistry, scientists have been able to make important discoveries in biology and medicine.
| A．it | B．what | C．which | D．that |
I threatened to report the taxi driver for illegally _______ a passenger, but he pointed at his “Not for Hire” sign and drove away.
| A．infecting | B．attending |
| C．disposing | D．rejecting |
It is easy for people to ________ the bad habits such as smoking and drinking, which are not so easy to get rid of.
| A．break into | B．look into |
| C．slide into | D．knock into |
She now has to return home to have a long-time rest at her young age, because her health _____ under the great pressure of work.
| A．broke away | B．broke up |
| C．broke down | D．broke off |
________ stopping polluting the earth ________ hope to live in a better environment.
| A．Only to; we can | B．Only to; can we |
| C．Only by; can we | D．Only by; we can |
His friends were ___________and encouraged him to publish his ideas, but Copernicus was cautious.
| A．technical | B．official |
| C．educated | D．enthusiastic |