However, at times this balance in nature is ________ resulting in a number of possibly unforeseen effects.
A. troubled B. bothered C mixed D. disturbed
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 |
The moment she heard of the news that her son was involved in the crime,
she pale.
| A．went |
| B．got |
| C．changed |
| D．appeared |