There are ______________ birds there in the sky.

Do you know what Millie and Andy were doing at 8 o’clock yesterday?—Yes.While Millie ______ TV, Andy ______ a book in the bedroom.

I sit _____ bus to enjoy a better view. [ ]

Listen! There is a knock on the door．Who _____ it be?—It must be Jack．Just now I sent for him．

Where do you sit, Jane?— I sit __________ Linda. She is just on my left. [ ]