How is it that you know she’s got back from the UK? —She ____ when I came out of the house this morning

Don’t put off _______ to the doctor when you are ill.

While the boy ______ down the street, theUFO _____ .

esident stood by a window inside the room, ________ I entered, looking over the square.

It is required that the students ______ mobile phones in our school, so seldom ______ them using one.