单项选择题

The police ascertained that there were no signs that the fire had been set______.

A．virtually
B．occasionally
C．incidentally
D．deliberately
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单项选择题
Mainstream economists profess much puzzlement over the failure of the rate of productivity growth to______ so far in this decade.
A．accelerate
B．prevail
C．aggregate
D．precede
单项选择题
Both certificates are______ for three months and the ceremony must take place in the district where notice has been given.
A．valuable
B．effective
C．valid
D．functional
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