The correct answer is: The legal sovereign in England is the Queen/King-in-Parliament.
In the United Kingdom, the concept of sovereignty is embodied in the Crown, but it is exercised by the Queen/King-in-Parliament, which means the monarch (currently King Charles III) acting with the approval of Parliament. This means that the monarch's powers are limited by the laws and conventions of Parliament, and they cannot act unilaterally.
The correct answer is: It was expected by Alexander that he would conquer the world.
This sentence is in the passive voice, whereas the original sentence is in the active voice. The meaning of the sentence remains the same, but the focus shifts from Alexander (the doer) to the expectation (the action).