Had they known what was coming next, they _________second thoughts．
A．may haveB．could have
C．must have hadD．might have had
Studying Tom’s menu, I found that many of the items are similar to ________ of McDonald’s．
A．thoseB．onesC．anyD．all
People who do not smoke have less ______of suffering from lung cancer than those who do so．
A．potentialB．pattern
C．preferenceD．prejudice
This factory produced much dirty water, which resulted in a wide______of environmental problems．
A．branchB．range
C．speciesD．wave
Please tell me how the accident _______．I am still in the dark．
A．came upB．came out
C．came toD．came about
It is______ of him to set his aim high but do little, so he is always leaving things undone．
A．specificB．typical
C．flexibleD．widespread
