--- I’m sorry, but there’s no smoking on this flight.
--- Oh, I ______ that. Sorry, I won’t again.
| A．don’t know | B．didn’t know |
| C．won’t know | D．haven’t known |
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 |
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 |
Keep up good state of mind even if you___________ fail plenty of times.
| A．must | B．will | C．can | D．should |
--The prison was ___________ fire last night.
--Someone must have set fire___________ it.
| A．on ; with | B．on ; to | C．over; with | D．should |