Выберите правильное слово:1) I039;d like to borrow this book.Has Anna read

Выберите правильное слово:
1) I'd like to borrow this book.Has Anna read it.........?
a)for
b)just
c)yet
2)Ben writes very quickly.He's ......... finished his essay?
a)already
b)for
2)yet
3. What a strange dog.I have.........seen such dogs before?
a)already
b)since
c)never
4.Oh!Somebody has .........knocked on the door?
a)for
b)just
c)since