Every means______tried but without any result．

单项选择题As a salesman, he works on a (an) ______ basis, taking 10% of everything he sells.

单项选择题It is said that a grave of a middle aged man ______ about 2,300 BC was found by some English archaeologists in the year of 2002.

单项选择题I'll show my ______ to you as soon as they come out.

单项选择题It is essential that these application ______ forms back as early as possible.

单项选择题Dr. Smith was always ______ the poor and the sick, often providing them with free medical care.

单项选择题—You'd better ______ work too hard like this. —I see. You mean ______ too hard makes one tired and ill.

单项选择题You aye a team star! Working with ______ is really your cup of tea．

单项选择题I（）have watched that movie--it'll give me horrible dreams.

A.shouldn' t
B.needn' t
C.couldn't
D.mustn't

单项选择题______ is best known for the technique of dramatic monologue in his poems.

单项选择题He was made______the ohl lady______breaking her window.