With all his money, he ________ worry about a little thing like 5 cents!
A．can B．must
C．may D．should
—It's no easy task to catch a ticket on a website that receives 1 billion clicks daily.
—I can't agree with you more. There ________ be errors for every single step.
A．should B．must
C．can D．will
The family ________ on time, but their car had a flat tyre on the halfway.
A．would arrive B．could arrive
C．must have arrived D．could have arrived
The public transportation is very convenient in that big city, so there ________ be any difficulty in traveling around.
A．mustn't B．wouldn't
C．shouldn't D．needn't
—Is the letter from your mother?
—Yes. But she ________ the letter herself, because she doesn't even know one word.
A．needn't have written B．can't have written
C．might not have written D．should not have written
The Internet plays an important role in our life. Without the Internet, life ________ quite different nowadays.
A．would be B．will be
C．is D．was
