－It was the headmaster, Tony. You______hello to him.－Sorry. I didn’t notice him.

I was about to leave my house________the phone rang.

Hearing the________story,the little boy had a________ expression on his face.[ ]

The number ofstudents in our school____about 2.000 and ____ them work hard at their lessons.[ ]

Medicine shouldn’t be kept _______ it isaccessible to children.