Tổng tất cả số phức z thỏa mãn \(z-\overline{z}={{z}^{2}}\) bằng
A.$1$
B.$2$
C.$2-2i$
D.$-2i$

Số phức $z$ thỏa mãn $2\left( z+2-3i \right)i+2i=6-2i$ là
A.$2-2i$
B.$-4i$
C.$-4$
D.$2+2i$

Số phức nào sau đây thỏa mãn $\left( 1-i \right)\overline{z}=2i$
A.\(1+i\)
B.$-1-i$
C.\(1-i\)
D.$-1+i$

Có bao nhiêu số phức z thỏa mãn $\left| z-3i \right|=5$ và $\dfrac{z}{z-4}$ là số thuần ảo ?
A. $0$          
B.. $1$              
C.$2$
D.Vô số    

Choose the answer among A, B, C, D to complete each of the sentences below:
When they finished singing, Lisa _______ the candles on the cake.
A.blew out
B.turned off
C.cleared up
D.brought out

Choose the word or phrase A, B, C or D that best completes the sentence or substitutes for the underlined word or phrase.
We could make better ______ of our energy resources.
A.spend
B.use
C.limit
D.need

Choose the answer among A, B, C, D to complete each of the sentences below:
We need ________actions and interventions of the local authorities to prevent national parks from being destroyed by pollution.
A.excitedly
B.timely
C.approximately
D.threateningly

Choose the answer among A, B, C, D to complete each of the sentences below:
He eventually ______ his disability to achieve some business success.
A.overcame
B.overwhelmed
C.destroyed
D.suffered

Choose the word or phrase A, B, C or D that best completes the sentence or substitutes for the underlined word or phrase.
__________ is produced from the heat stored in the earth's core.
A.Water energy
B.Geothermal energy
C.Nuclear energy
D.Solar energy

Choose the answer among A, B, C, D to complete each of the sentences below:
________ from Bill, all the students said they would go to the party.
A.Except
B.Apart
C.Only
D.Separate