单项选择题

(Breaking) up water (into) hydrogen and oxygen is a good example of (as) is known as (a chemical change).

A．Breaking
B．into
C．as
D．a chemical change

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单项选择题

(Comparing) money with friends, I prefer the latter (more), (for) real friends are not easy (to come by), and we must value their real friendship.

A．Comparing
B．more
C．for
D．to come by

单项选择题

Seriously, (though), there's always (something you wish) you (have not done), but (what is done) cannot be undone.

A．though
B．something you wish
C．have not done
D．what is done

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