It is such a difficult problem _______ no one can work out.
| A．as | B．that | C．so | D．thus |
The Wall Street Journal reports several research studies conducted over the past few years show a persons personality changes _____ time.
| A．in | B．on | C．without | D．over |
________preparations from now on, she would be able to finish the essay on Sunday.
| A．Would she make | B．If she make |
| C．Were she to make | D．If she had made |
A person who has slept well will have a clear mind and work efficiently in the daytime ______ people with sleep disorders find it difficult to concentrate during the day.
| A．unless | B．while | C．if | D．until |
In today’s fiercely competitive society,； people only care about what achievements you _______, not your efforts.
| A．had made | B．will make | C．would make | D．have made |
Dating violence is _____ one person purposely hurts or scares someone they are dating.
| A．when | B．what | C．that | D．why |