So far no life has been found outside the earth, but while some scientists are actively searching for living things in outer space, others firmly believe there ____ .

I was about to inform you of the sudden change ______an unexpected visitor came

It is ten years since he _______ in this college

We’ve spent too much money recently.—Well, it isn’t surprising, Our friends and relatives_______ around all the time

ang _____as a secretary for five years inthe company, and now she is a general manager of it