________ he works hard, I don't mind when he finishes the experiment.

A．As soon as                 B．As well as

C．So far as                      D．So long as

_____you don’t lose heart, it will be easy for you to overcome the difficulties.

A man may usually be known by the books he reads        by the friends he made with.

A．as if              B．as good as         C．so far as           D．as well as

_____ three influenza type A virus subtypes（子类型） have been found in pigs．