66、That voung man still denies__________the fire behind the store．
A．start
B．to start
C．having started
D．to have started


67、 __________ under a microscope，a fresh snowflake has a delicate six-pointed shape．
A．Seen
B．Seeing
C．To see
D．To be seen


68、 A liar cannot make himseIf__________．
A．believe
B．to believe
C．believing
D．believed


69、 Not until Columbus discovered America__________ to Europe．
A．bananas were brought
B．are bananas brought
C．bananas brough!
D．were bananas brought


70、 You don't have to be in such a hurry．1 would rather you__________ on business first．
A．would go
B．will go
C．went
D．have gone


71、 It is important that the hotel reeeptionist__________that guests are registered correctly
A．has made sure
B．made sure
C．must make sure
D．make sure


72、 Final grades should be__________plenty of good evidence．
A．based on
B．basis on
C．adjusted to
D．on foundation of


73、 The lady’s appointment would be terminated as of September 29，unless__________ to that time she requested a hearing．
A．superior
B．inferior
C．prior
D．junior


74、 It，s a pity th'at Professor Smith has failed to make his idea__________ in the classroom.
A．understanding
B．to be understood
C．understood
D．to understand


75、Tired __________ he was，he insisted on going ahead with the plan at once．
A．even if
B．Hthough
C．likel
D．as