单项选择题

All substances, ________ , liquid or solid, are made up of atoms.

A．be they gases
B．whether they are gases
C．they are gases
D．they can be gases
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单项选择题
During last decade, there have been many changes in family life. Are these changes ________
A．for the good or for the bad
B．for the worse or for the better
C．for worse or for better
D．for the worst or for the best
单项选择题
Is it important that he ________ his education in all ways
A．develop
B．develops
C．will develop
D．developed
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