The discovery was a major______________________ for research workers.
A.breakthrough 
B.breakdown
C.break-in
D.breakout

Nobody knows what the_____________________ of the expiosion was.
A.source
B.cause
C.reaction
D.reason

Several items of_______________________ were found on the river bank.
A.clothes
B.dress
C.costume
D.clothing

He kindly offered to_______________________ me the way to the station.
A.explain
B.direct 
C.describe
D.show

That large dog is perfectly______________________ and has never been known to attack anyone.
A.harming 
B.unharmed
C.harmless
D.harmful

- “Did he make any comments?” - “Yes. he said it was imperative that we_________ on time tomorrow.”
A.had been 
B.were
C.have been 
D.be

There is water below the earth’s surface____________________ everywhere.
A.most
B.most of
C.almost
D.in

Are there enough apples for us to have one_________?
A.every
B.each
C.individually
D.self

He looks much better________ the holiday he took.
A.for
B.of
C.to
D.in

Chọn từ có cách phát âm khác với các từ còn lại.
A. attract
B.argument
C.apply
D.vacancy