The student didn’t pay any attention to the lecture; he ________ of something else. 
#104749
A
thought
B
had thought
C
would think
D
was thinking
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The little boy is dirty from head to foot because he______in the mud all morning.
#104172
A
has played  
B
is playing
C
has been playing
D
was playing
E-mail, as well as telephone, ________ an important part in daily communication
#102800
A
is playing
B
have played
C
are playing
D
play
 — Bob has gone to California.— Oh, can you tell me when he ______? 
#102361
A
has left
B
left
C
is leaving
D
would leaving
 I ____ Mr. White at that time, otherwise I wouldn’t have asked you for some information about him. 
#101527
A
hadn’t known
B
don’t know
C
didn’t know
D
haven’t known