1.Copernicus maintained that the earth ______ round the sun.
A.moves B.moved
C.moving D.move
2.He was very ______ to go，but he had no choice.
A.ready B.willing
C.reluctant D.hesitant
3.Two-thirds of his property ______ lost in the fire.
A.was B.were
C.are D.have been
4.Remember，nothing hurts concentration ______ reading too slowly.
A.rather than B.as well as
C.more than D.instead of
5.Many people have made a ______ to a physical fitness program so as to maintain good health.
A.decision B.commitment
C.contribution D.difference
1.正确答案：A 答案解析：表述永恒的真理或客观规律用一般现在时，不管主句谓语用什么时态。而“地球绕着太阳转”是客观规律，所以选A.
2.正确答案：C 答案解析：reluctant“不愿的，勉强的”：“他非常不愿意去，但他别无选择”，所以，reluctant用于本句合适。Hesitant“踌躇的，犹豫的”;ready“准备好的”;willing“愿意的”。
3.正确答案：A 答案解析：以分数限定的名词做主语时，谓语的单复数应同该名词保持一致，而不管分数是单数还是复数。此句中property(财产)是不可数名词，故用单数形式的动词。
4.正确答案：C 答案解析：nothing…more than是习惯用语，意思为“什么也比不上…更…”。句子意思为：记住，什么也比不上读得太慢更伤害注意力的集中了。
5.正确答案：B 答案解析：本句是带有不定式短语作目的状语的简单句。句意为“许多人都投入了身体锻炼计划，以保持良好的健康”。make a commitment“投入，保证”符合题意。
