In which sentence is all CAPATALIZATION correct?

I need to find someone to teach me Arabic. .…teacher would you recommend.

“How….................. do you study?” the teacher asked him.

We… ........... in the hot sun for nearly an hour and the bus still has not come.

Wife: did you forget to buy milk? Husband: I didn't forget. But by the time I arrived to the shop, they .......

The washing machine .................. for only a small charge. I don’t know why it is so expensive.