I didn’t quite follow him because he explained the theory _____that is too abstract for me.
_____ by the latest electronic toys, the little boy stood in front of the windows, without moving.
It seems that living green is ________ easy and affordable. A small step makes a big difference.
A housing bubble is an economic situation _____ occurs when house prices rise much too fast.
—Don’t be so naughty! Be your ________.—Got it,mum.
—“Crash diets” make us lose weight fast and I am all into that. —But it_______better to work out.