—It’s only ten minutes’ walk; I could have got there on foot. — Yes. A taxi _______ not at all necessary.
That tree, __________ are almost bare, is a very old one.
The reason ____ she was absent is _____ he was badly ill yesterday.
It suddenly _____ to the detective that the professor was probably murdered by his own wife .
---What made her unhappy? ---_____.
The machine might break down someday in the future, ____, you can dial this number for help.