The young mother saw her baby fall to the ground, brought her heart to her mouth．
| A．it | B．and which | C．and that | D．this |
It's obvious that the experiment ______ a great success.
| A．kept |
| B．showed |
| C．proved |
| D．remained |
To their great ______ , Tom's problem proved not to be as serious as they had feared.
| A．happy |
| B．worry |
| C．anxiety |
| D．relief |
______ we had read your letter ______ the true state of affairs.
| A．It was until; that we understood |
| B．It was not until; that we understood |
| C．Until; did not we understand |
| D．Not until; we understand |
Take the medicine and have a good sleep, but if the pain continues, ______ your doctor.
| A．confirm |
| B．consult |
| C．consider |
| D．convince |
The earlier settlers learned to farm the land through ______ and error.
| A．test |
| B．trial |
| C．experiment |
| D．try |