— 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.
#62311
A
should
B
must
C
will
D
can
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My sister met him at Ningbo Grand Theatre yesterday afternoon, so he         your lecture. 
#63615
A
couldn’t attend
B
mustn’t have attended
C
shouldn’t attend
D
couldn’t have attended
The flowers in my room         every day, or they’ll die.
#75306
A
must water
B
must be watered
C
should water
D
can be watered