Everyone in our class works as hard as they can ________ to enter a good college.

---Does your brother serve in the army?

---No, not now. But he ________ in the army for 8 years.

______ a pair of compasses, it is easy to describe a circle.

---He will take you as well.

---But I’d rather he ______.

All her time _______ experiments, she has no time for films.

Do you know the man from ________ house the pictures were stolen？

_______ the temperature down day by day, the leaves are turning yellow.

His uncle went abroad in 2010, and _______since.

It was not until he came back _____ he knew the police were looking for him.

I don't think there will be many students left in the class，_______，because the conditions are not fit for studying.