【单选题】
Many automobile accidents were ____ careless driving.
【单选题】
To obtain a satisfactory result, one must apply
two ____ of paint on a clean surface.
【单选题】
No one would have time to read or listen to an account of everything ____going on in the world.
【单选题】
They have done things they ought_____.
【单选题】
____ native to North America, corn has now spread all over the world.
【单选题】
Bit by bit, a child makes the necessary changes to make his language ____.
【单选题】
Please____ me whether I should accept the offer.
【单选题】
All the flights ____ because of the snowstorm, we had
to take the train instead.
【单选题】
Everything is right here, _____?
【单选题】
A camera takes light rays bounced off objects and____ them
on a sheet of a film.