The operation room in every hospital has to ______ bacteria of any kind.
| A．keep free from | B．make it free from | C．be made free from | D．be kept free from |
We can’t go on with the experiment because the computer_________.
| A．hasn’t been repaired | B．hasn’t repaired |
| C．is not repaired | D．hadn’t been repaired |
You can’t see the___________ now for they are having a meeting at the moment.
| A．editor-in-chiefs | B．by an hour |
| C．by hour | D．each hour |
The two sides have finally___________, though some small differences still exist.
| A．made a decision | B．reached an agreement |
| C．settled down | D．broken up |
He has a part - time job and was paid___________.
| A．by the hour | B．by an hour | C．by hour | D．each hour |
The sunlight came in____________ the windows in the roof and lit up the whole room.
| A．through | B．across | C．by hour | D．each hour |