Question 7; The answer is not unique, such as ∠B=∠C, AB=AC, or ∠ADE=∠AED, etc.
The eighth question; 25 ,2
Question 9; B
Question10; D
The eleventh question; B
Question12; C
Question13; The answer is not unique, such as adding AF vertical CE,
∫CP sharing∠ ∠ACD
∴∠ACE=∠AED
Ab parallel CD
∴∠AEC=∠ECD
∴∠ACE=∠AEC
∴AC=AE
Af vertical CE
∴∠AFC=∠AFE=90
At △ACF and △AEF,
∠AFC=∠AFE
∠ACF=∠AEF
∴△ACF congruent AEF(AAS)
Seeing how hard I type, just take it.