1,___air is to man,so is water to fish.

1,___air is to man,so is water to fish.
A.like B.as C.since D.just
2,I wonder how many years ago____
A.did your father retire
B.your father retired
C has your father retired
D your father has retired
3______ all behavior is learned behavior is a basic assumption of social scientists.
A.Nearly B.That nearly.C.It is nearly D.When nearly
4.it is strange______
A that no one should like this book
B that no one liked this book
答案应该是bbba .
4为什么是虚拟语气。
要是能再具体点就更好了。