Sometimes he found _______very hard to fall asleep at night, so he went to see the doctor．

– It is said that Frank is very rich and is always changing his private cars .What is he?–_______ of a manager, I am not sure.

—I like the yellow new Beetle. —A smart car but we can’t afford_________ for the time being.

--- Who helped you clean the classroom yesterday? --- _______. I cleaned it all by myself.

I’m moving to the countryside because the air there is much fresher than ________ in the city.