| 1 | They jointly completed this arduous task. | |
| 2 | Only by being united can we accomplish this arduous task. | |
| 3 | This task is too daunting and it will require full effort in order to achieve success. | |
| 4 | Generally speaking, this plan is very difficult and requires thorough preparation to achieve it. | |
| 5 | They successively completed a series of difficult tasks and won the praise of the company. |
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