单项选择题

Even professional marketers are never sure （） some new products are runaway successes while others fail miserably.

A.for
B.why
C.since
D.whoever

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单项选择题
The manager noted that sales of smaller models had risen significantly but （） mentioned the drop-off in orders for the electric version.

A.too
B.also
C.either
D.besides
单项选择题
The company may have to （） some production procedures which, since the earliest days, have always been done by skilled craftsmen.

A.process
B.calculate
C.automate
D.manufacture
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