The little boy, out of curiosity, _______ the toy to see how it worked, but couldn’t put it together.

—How often does your sister surf the internet?—About            .

 I'm afraid physics is completely ________ me and I have to ask you for help.

At that very moment my mind went completely_______ and I forgot what I was supposed to be doing.

The expert says that nowadays there are too many problems linked to poor diet and a ________of exercise.