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

Choose the answer among A, B, C, D to complete each of the sentences below:
John ________ knowledge from many of his life experiences to his work.
A.applied
B.accomplished
C.approved
D.appreciated

Choose the answer among A, B, C, D to complete each of the sentences below:
I could tell he was nervous because he was _____ in his chair.
 
A.fumbling
B.harassing
C.fidgeting
D.flustering

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
The detective checked everyone’s story and by a _______ of eliminations they were left with on suspect.
A.time
B.process
C.progress
D.period