21.---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
22.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
23.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
