Sorry, I have to _____ now. It’s time for class.— OK, I’ll call back later.

Will you see to _____ that all the papers should be handed in after class?— All right. [ ]

Hurry up! The bus is coming.—Wait a minute. Don’t cross the street ____________the traffic lights are green.

Cheer up, children. We should learn to be enough to take on any challenge!

Did you see Peter and Mike — No, I saw ______of them.