I'll stay here _____ everyone else comes back.
| A．even if | B．as though | C．because | D．until |
. Many new _____ will be opened up in the future for those with a university education.
| A．opportunities | B．realities | C．necessities | D．probabilities |
.It isn't quite _____ that he will be present at the meeting.
| A．sure | B．right | C．exact | D．certain |
John was very upset because he was _____ by the police with breaking the law.
| A．accused | B．arrested | C．sentenced | D．charged |
The child enjoyed _____ up the wooden bricks then knocking them down.
| A．adding | B．pushing | C．piling | D．forming |
. Mary had taken _____ to see that her guests had everything that they could possibly want.
| A．efforts | B．pains | C．attempts | D．endeavors |