People try to avoid public transportation delays by using their own cars，and this________creates further problems.
| A．in short | B．in case |
| C．in doubt | D．in turn |
There will be no going back our decision is made.
| A．until | B．unless | C．once | D．before |
The woods are remains of a huge forest once covered the whole area.
| A．where | B．which | C．whose | D．when |
—Have you found a new job, Jim?
— Not yet. I really regret the IBM's offer.
| A．to turn down | B．turning down |
| C．turned down | D．turn down |
Carl hopes to win the tennis game one day. That is he has been practicing hard.
| A．why | B．how | C．because | D．where |
Ever since the patients moved to the new hospital last year, they better medical treatment.
| A．have received | B．had received |
| C．will receive | D．received |