She was tired because she on the computer A) had been working
B) was working
C) worked

Larry and Sergey at college when they met.
A) were studying
B) studied
C) study

Bees were all around,
A) stinging
B) biting
C) buzzing

Did you have a good time at the ballet?
A) it was fantastic
B) yes, it’s great.
C) I couldn’t put it down.