—I called you at 4:00 yesterday afternoon, but no one answered.

        —Sorry, I ______ with my friends at that time.

     A. swim        B. swam         C. will swim      D. was swimming

— I called you at nine this morning, but there was no answer.

— Oh, sorry, I ______ with my sister in the shopping center.

-I called you at nine this morning, but there was no answer.

           - Oh, sorry. I _______ with my cousin in the supermarket.

         A. shop               B. was shopping       C. will shop

--- What smells terrible, Ted?
--- I’m sorry. I’ll ___ my shoes and wash them at once.

---What ______ the noise, Bill?

---Sorry, I broke my glass.

A．is                B．was              C．has been          D．will be