—Why are you so nervous?
—To our great surprise, we found by the strangers.
| A．we monitored | B．ourselves monitored |
| C．us to monitor | D．ourselves monitoring |
The new tax would force companies to __________energy-saving measures.
A. adaptB. adoptC. adjust D address
If the American government the expert’s suggestion, the world economy would not be in such a mess now.
| A．followed | B．follows |
| C．should follow | D．had followed |
He had hardly reached home _______ an unexpected guest came to visit him.
| A．then | B．when | C．the moment | D．than |
Had they known what was coming next, they ___________ second thoughts.
| A．may have | B．could have | C．must have had | D．might have had |
I don’t know how it ___________ that our car was bumped from behind.
| A．let out | B．gave out | C．got about | D．came about |