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—I phoned you at 7:00 this morning. But there was no answer.

—Well, maybe I _________ morning exercises at that time.

A．was doing         B．did               C．is doing           D．would do

I phoned you at six yesterday evening, ______ nobody answered.

    A. because      B. or           C. but          D. so

—I phoned you at 5:00 yesterday afternoon, but nobody answered me.

—Sorry. I          the flowers in the garden at that time.

A. was watering                   B. am watering           C. water             D. will water

--- Is my answer to the math problem right?

--- Let me consider it caredully 　　 I give you an answer.

　 A. before　 B. after　 C. since　 D. as soon as