单项选择题

Some students can't attend ground classes because they ______.

A．are too lazy
B．don't have the money to study
C．may not be able to attend classes for military reasons
D．are sick or too busy
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单项选择题
There are advantages and disadvantages of online distance learning. One advantage is ______.
A．it is easy to do
B．it is cheaper than face-to-face learning
C．it is convenient
D．it is satisfying
单项选择题
Online courses keep learners very ______.
A．happy
B．busy
C．satisfied
D．free to do many things
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