---How is your plan getting along?----I can’t carry on _____ any longer. Someone must help me.

Young people spend most of their time _________, for they don’t want to stay at home all day.

I’m sorry I didn’t recognize you just now. You look different _________.

When we sleep is      cultural as biological-and practices differ greatly round the globe.

The charity sale our school organizes every year has taught us much that we would never have _____ learned in class.