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The; a A; a The; the A; the
the fact that viruses have been known to mutate the fact that a cancer-immune individual may lose his immunity the fact that production of human cancer cells might be due to a genetic factor the fact that man is host to many viruses
did man know man had known man knew had man known
man may usually be known by the books he reads _____ by the friends he keeps. A. as usual as soon as as if as well as
the fact that viruses have been known to mutate the fact that a cancer-immune individual may lose his immunity the fact that production of human cancer cells might be due to a genetic factor the fact that man is host to many viruses
by the man by the woman by the company the firm
a well-known man he is well-known he is a man a well-known man is he well-known a man is he
viruses are known to cause cancer in animals at present, human cancer is not believed to be contagious (传染的) there are many known causes for the transformation of a normal cell to a cancer cell results of experiments on plants and animals do not vary greatly from species tn species
would do; knew may do; knew might do; knows should do; had known
they are innocuous agencies they are the causative agents of most human cancer they seem to be infections to many people they are generally thought to be relevant to most cancer in man
as well as as if as soon as as usual
viruses are known to cause cancer in animals at present, human cancer is not believed to be contagious (传染的) there are many known causes for the transformation of a normal cell to a cancer cell results of experiments on plants and animals do not vary greatly from species tn species
the fact that viruses have been known to mutate the fact that a cancer-immune individual may lose his immunity the fact that production of human cancer cells might be due to a genetic factor the fact that man is host to many viruses
the fact that viruses have been known to mutate the fact that a cancer-immune individual may lose his immunity the fact that production of human cancer cells might be due to a genetic factor the fact that man is host to many viruses
The; a A; a The; the A; the
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