I failed again in the examination and only then _____ how much time I had wasted.
| A．I realized | B．I had realized | C．did I realize | D．had I realized |
They are broadening the bridge to ________ the flow of traffic.
| A．put off | B．speed up | C．turn on | D．work out |
There are a small number of people involved, possibly ______twenty.
| A．as few as | B．as little as | C．as many as | D．as much as |
Only after Mary read her essay the second time the spelling mistake.
| A．did she notice. | B．she notice. |
| C．does she notice | D．she has noticed |
—Are you still mad at her?
—Not really, but I can’t ______ that her remarks hurt me.
| A．deny | B．refuse | C．reject | D．decline |
He had planned to make a compromise，buthe changed his mind at the last minute．
| A．therefore | B．otherwise | C．anyhow | D．somehow |