epting lower prices, organizers can sell tickets that would ______ go unsold.

There aren’t many seats left for the play; you had better make sure that you two today

I drove to Zhuhai for the air show last week— Is that ____________ you had a few days off?

Shall we get off the bus here—Yes. But we won’t get off _______ it stops.

y ways, the education system in the US is not very different from _________in the UK.