____you stepped into the lab with your shoes on? You are supposed to take them off before you enter it.
| A．How come | B．How about | C．How dare | D．How long |
Every evening after dinner，if not ________ from work，I will spend some time walking my dog.
| A．being tired | B．tiring |
| C．tired | D．to be tired |
—I didn't go to see the doctor yesterday.
—But you ________.
| A．ought | B．ought to |
| C．ought to be | D．ought to have |
I don't mind her criticizing me，but ________ is how she does it that I object to.
| A．it | B．that | C．this | D．which |
It was last night ________ I saw the comet.
| A．the time | B．when | C．that | D．which |
—Did Linda see the traffic accident?
—No，no sooner ________ than it happened.
| A．had she gone | B．she had gone |
| C．has she gone | D．she has gone |