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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 They _______ when they heard him confess his fault.
#104169
A
had been surprising
B
were surprising
C
were surprised  
D
had been surprised
Large quantities of information___since then as to how the program has worked.
#99507
A
has been offered
B
were offered
C
have been offered
D
was offered
Father finally came back home, which I ___ forward it.
#103583
A
had been looking
B
have been looking
C
looked
D
have looked