Criticism and self-criticism is necessary _____ it helps us to correct our mistakes.
| A．by that | B．at that | C．on that | D．in that |
You must work hard,____ you will not learn English well.
| A．if | B．whether | C．otherwise | D．unless |
____production up by 60%, the company has had another excellent year.
| A．As | B．For | C．With | D．Through |
The book is not easy.____ it's rather difficult.
| A．On the one hand | B．On the contrary |
| C．On the other hand | D．On the other contrary |
The number of the employees has grown from 1,000 to 1,200. This means it has risen ____20 percent.
| A．by | B．at | C．to | D．with |
He spoke loudly ____ the audience could hear him clearly.
| A．so | B．that | C．so that | D．in order to |