Rewrite the following sentences:
It is acknowledged that Vietnam had a complete control over SARS from a very early stage of the epidemic.
A.Viet Nam is acknowleged to have had a complete control over SARS from a very early stage of the epidemic.
B.Viet Nam was acknowleged to have had a complete control over SARS from a very early stage of the epidemic.
C.Viet Nam has been acknowleged to have had a complete control over SARS from a very early stage of the epidemic.
D.Viet Nam had acknowleged to have had a complete control over SARS from a very early stage of the epidemic.

All of the following are true of a memory trace EXCEPT that ____.
A.it is probably made by structural changes in the brain
B.it is related to the degree of recall supported by repetition
C.it is able to be observed directly by investigators
D.it is theoretical construct that we use to form hypotheses

__________ (62)
A.field
B.category
C.group
D.class

__________ (63)
A.work
B.employment
C.occupation
D.line

__________ (65)
A.formed
B.set
C.founded
D.established

__________ (66)
A.instruct
B.oblige
C.demand
D.direct

__________ (67)
A.instance
B.case
C.specimen
D.model

__________ (69)
A.exclude
B.reject
C.object
D.disapprove

__________ (70)
A.impressed
B.convinced
C.affected
D.taken

__________ (71)
A.common
B.same
C.similar
D.joint