单项选择题

For a start, Apple has had the tablet field to itself for a year, allowing it to refine its offering and ______the bar for rivals.

A．rise
B．rose
C．raised
D．raise
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单项选择题
It is because she is too inexperienced ______ she does not know how to deal with the situation.
A．so
B．that
C．so that
D．therefore
单项选择题
Some of the rubbish, such as food, paper and iron, ______ away over a long period of time.
A．rot
B．rots
C．is rotting
D．are rotted
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