Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
This product has not been tried _____ humans yet.
A.out
B.on for
C.on
D.out on

A.clothes
B.bosses
C.boxes
D.couches

A.solidarity
B.effectively
C.documentary
D.dedication

My purse ______ at the station while I ______ for the train.
A.must have been stolen/was waiting
B.should have stolen/had been waiting
C.will be stolen/am waiting
D.had to steal/would be waiting

I suggest our rooms_________ before Tet Holiday.
A.should decorate
B.is decorated
C.were decorated
D.be decorated

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
The way in which we work has _______ a complete transformation in the past decade.
A.undercovered
B.undertaken
C.undergone
D.underdone

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
These days, housework has been made much easier by electrical ______.
A.machinery
B.appliances
C.instruments
D.equipment

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
The island where these rare birds nest has been declared a(n) ______ where poaching is prohibited.
A.observation
B.reservation
C.preservation
D.conservation

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
The play is quite suitable for children to see as there is nothing ______ in it.
A.exceptional
B.excessive
C.exceptionable
D.offended

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
It turned out that I ______ have bought Frank a present after all.
A.oughtn't
B.mustn't
C.needn't
D.mightn't