Was it in 2002 __________ he was still at middle school __________ the boy became expert at computer?
All her time _______ experiments, she has no time for films.
---He will take you as well. ---But I’d rather he ______.
______ a pair of compasses, it is easy to describe a circle.
---Does your brother serve in the army? ---No, not now. But he ________ in the army for 8 years.
Everyone in our class works as hard as they can ________ to enter a good college.