[ Tenses ]
Ana: I did not go anywhere. But I ______________ (clean) the house all day, so maybe I didn’t hear the phone ring.
A. Have been cleaning
B. Have cleaned
C. Cleaned
D. Am cleaning

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Grammar › ViewYesterday, I went to the post office. I went there to post ______ letter.
A. a
B. an
C. the
D. –
Homophones › View
I decided to ________ the house for protection in the event of a flood.
A. Insure
B. Ensure