a) arrived

helped

looked

received

remembered

rented

returned

talked

visited

b) was / were

had

went

took

bought

saw

thought

wore

put

ate

spoke

taught

gave

got

Tính mô đun của số phức z thỏa mãn  z 2 + 3 i + i = z .

A. 1 10

B. 3

C. 10

D. 3