Had they known what was coming next, they _________second thoughts．
| A．may have | B．could have |
| C．must have had | D．might have had |
______ at the man, she was frightened by his facial expression.
| A．To stare | B．Staring | C．Stared | D．Being stared |
The wire was found broken. And ______, there happened to be no one getting near.
| A．therefore | B．however | C．otherwise | D．fortunately |
I ______, no, I am quite certain, that he is unwelcome in the neighborhood.
| A．conclude | B．suspect | C．reject | D．quarrel |
— How was his explanation at the court?
— So convincing ______ that I entirely approved of it.
| A．sounds it | B．it sounds | C．does it sound | D．did it sound |
______ such experience will constantly trouble you in your business.
| A．Lacking | B．Lack | C．Being lack | D．To be lacked |