A black square PQRS has been cut into two parts. One part of it is shown in Panel I. Which one of the shapes in Panel II is the other part?

'When it is raining, peacocks dance.'

Based only on this sentence, which one of the following options is necessarily true?

The figure shows two 4-tile patterns.

Either one or both of the patterns can be used any number of times and in any orientation to construct a new pattern. Which one of the options below cannot be constructed by using only these two 4-tile patterns assuming there are no overlaps among them?

'When the teacher is in the room, all students stand silently.'

If the above statement is true, which one of the following statements is not necessarily true?