Why are bitcoins of great concern to governments?
A.Because most of bitcoin owners are hackers.
B.Because bitcoins may be used in illegal transactions.
C.Because the value of bitcoins is fluctuating wildly.
D.Because bitcoins will eventually replace national currencies.

What is the passage mainly about?
A.The future of bitcoins in the real world
B.A new kind of currency in the virtual world
C.A way of doing business in the virtual world
D.An alternative to bitcoins created by Nakamoto

Which of the following is defined in the passage?
A.Transactions
B.Public Databases
C.Credit cards
D.Bitcoins

Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.

A.educate
B.transfer
C.ancient
D.stranger

A.emotional
B.continuous
C.mandatory
D.adjustable

(23) ________
A.excluding
B.involving
C.having
D.including

(25) ________
A.offer
B.present
C.supply
D.provide

If/ it/ not rain/ tomorrow/ I/ go/ camping/ my friends.
A.If it does not rain tomorrow, I will go camping with my friends.
B.If it did not rain tomorrow, I will go camping with my friends.
C.If it does not rain tomorrow, I would go camping with my friends.
D.If it had not rained tomorrow, I will go camping with my friends.

I/ never/ travelled/ by/ air.
A.I have never travelled by air.
B.I have never been travelling by air.
C.I had never travelled by air.
D.I has never travelled by air.

Mark the letter A, B, C, or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges.
Mark is having a conversation with his mother.

Mark: “ ____________________”

Mother: “Never mind, better luck next time.”
A.I didn’t get the vacant position.
B.I’ve broken your precious vase.
C.I couldn’t keep my mind on work.
D.I have a lot on my mind.