改成：It is desired that she (should) be promoted to the position of the manager.
解釋：It's desired that...中，要求該從句采用虛擬語氣，即從句謂語動詞采用“（should）+動詞原形”構成。
2. I wish that they didn't leave so early that day.
改成：I wish that they hadn't left so early that day.
解釋：wish引導的賓語從句采用虛擬語氣，對過去的動作進行虛擬時從句采用過去完成時。
3. I could buy the ten-speed bicycle myself, but my mother promised to give it to me on my birthday.
改成：I could have bought the ten-speed bicycle myself, but my mother promised to give it to me on my birthday.
解釋：根據題意應該用虛擬語氣：could have done sth（本可以做某事，實際上未做）
4. I would rather that Miss Evans taught us English literature last semester.
改成：I would rather that Miss Evans had taught us English literature last semester.
解釋：would rather引導的賓語從句采用虛擬語氣，對過去的虛擬從句采用過去完成時。
5. "Don't you think it is time you work harder at your lessons?"the mother said to Tom.
改成："Don't you think it is time you worked harder at your lessons?" the mother said to Tom.
或："Don't you think it is time you should work harder at your lessons?" the mother said to Tom.
解釋：It's (high/about) time that...句型中，that從句采用虛擬語氣，即從句動詞采用“should+動詞原形”構成或用壹般過去時。