__________ the course very difficult , she decided to move to a lower level .
| A．Find | B．Finding | C．To find | D．Found |
______ do we owe the discovery of the wild land?
| A．What | B．Who |
| C．To whom | D．For what |
—How much should I pay for the ice cream?
—It's my ______.
| A．choice | B．treat |
| C．present | D．charge |
______ studying abroad can be hard， it can broaden your understanding of the world.
| A．If | B．While |
| C．Because | D．Since |
When I came in, I found Lucy ______ by the window ______ to music.
| A．seated; listening | B．seated; listened |
| C．seating; listened | D．seating; listening |
The lady who had invited us heard me telling my wife that the dinner was terrible, so I was ______ .
| A．confused | B．nervous |
| C．shameful | D．Embarrassed |