By the time he realizes he ______ into a trap, it’ll be too late for him to do anything about it.
#102277
A
walks  
B
walked
C
has walked
D
had walked
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Good heavens! There you are! We___anxious about you, and we ___you back throughout the night. 
#104668
A
are; expect
B
were; had expected
C
have been; were expecting
D
are; were expecting
While the police have already done a lot of investigation, much evidence ___   __.
#102763
A
is remaining to be confirmed
B
remained to be confirmed
C
is remained to be confirmed
D
remains to be confirmed