Solution
For this case the answer would be:
Statement Reason
1. VU congruent to ST, SV congruent to TU 1. Given
2. STUV is a parallelogram 2. Opposite sides congruent > parallelogram
3. VT = SU 3. diagonals of a parallelogram bisect each other
4. VX = XT 4. semidiagonals are congruent