Robert failed to complete his education____ he found it hard to focus on his studies.
| A．although | B．if | C．because | D．while |
We’ve never expected___ so many valuable finds from this archaeological site.
| A．there being | B．to there be | C．there to be | D．to be there |
The universe began with the Big Bang 13.7 billion years ago, with everything___ in space smaller than a grain of sand.
| A．started | B．starting | C．to start | D．to be started |
---How did the accident happen?
---The car went out of___ control and rushed into___ truck ahead of it.
| A．/, the | B．the. / | C．the, the | D．a, the |
. We are looking for an inexpensive hotel .
| A．where to live in | B．to live | C．in which to live | D．to be lived in |
Look out! Don’t get too close to the house the roof is under repair.
| A．whose | B．which | C．of which | D．what |