The scientist’s many years’ careful observation ____ a surprising discovery.
| A．ran into | B．began with | C．led to | D．came from |
Lawyers often make higher _____ for their work than they should.
| A．bills | B．charges | C．prices | D．costs |
One _____ needed when making a cake is flour; another is sugar.
| A．container | B．ingredient | C．content | D．equivalent |
. He looked rather untidy as there were two buttons _____ from his coat.
| A．loosing | B．losing | C．off | D．missing |
The _____ of the trees in the water was very clear.
| A．mirror | B．sight | C．reflection | D．shadow |
We all knew from the very _____ that the plan would fail.
| A．outcome | B．outset | C．income | D．output |