Susan decided not to work on the program at home because she didn’t’ want her parents to know what she __________.
#104009
A
has done
B
had done
C
was doing
D
is doing
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After school we went to the reading-room to do some reading, only to be told that it ____________.
#101081
A
was decorated
B
had decorated
C
had been decorating
D
was being decorated
—Which flight ________ ? —I want to catch the 13:00. 
#104768
A
you are to catch
B
are you catching
C
do you catch
D
have you caught
Getting to the cinema, quite out of breath, we found the film     for ten minutes. 
#102720
A
having been on
B
had begun
C
had been on
D
had been started