By the time my mother came back from work, my sister and I ________ supper and were waiting for her at the table.
#101144
A
have cooked 
B
were cooking
C
had cooked
D
would cook
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His failure in the experiment suggested that he ________ his teacher’s proper instructions.
#101852
A
should not have followed
B
should not follow
C
mustn’t have followed
D
hadn’t followed
 Oh, much smoke here! Somebody ________ the window, please.
#99446
A
opens
B
open
C
shall open
D
will open
—Such a mistake could have been avoided. —Unfortunately, he ________ the mistake again and again. 
#104785
A
repeated
B
would repeat
C
had repeated
D
would have repeated