He was familiar　　the animals.That means these animals were familiar　　　him

What do I have to do ______ I want tobe thinner?—Eat less, exercise more.

All the employees at the company are _______ their business as usual.

My father admitted that when _____comes to pop music, he had little knowledge of it. [ ]

Nowhere else in such a small town, I think, ___ a book as good as this one.