Even if we have an extremely healthy diet and lifestyle, the human body is programmed to _______ at a maximum of about 120 years, and usually less.
| A．wear well | B．wear away | C．wear off | D．wear out |
It is strongly ______ that the machines should be checked every year.
| A．recognized | B．recommended |
| C．recorded | D．recovered |
--Can I help you with the heavy bag?
--______.
| A．Thank you. | B．It doesn't matter. |
| C．No, I am all right. | D．Really? |
That tree, _______ branches are almost bare, is very old.
| A．of which | B．on which |
| C．in that | D．whose |
As a rule, domestic servants doing odd jobs are paid_______.
| A．by hour | B．by an hour |
| C．by hours | D．by the hour |
Why don’t you bring ____ to his attention that you are too busy to do it?
| A．that | B．what | C．it | D．which |