My father is busy _____ in the study.
We could hear birds ________in my hometown in the past, _________ now we can’t.
-- ____________ is it from here to the nearest hospital?--It takes about 15 minutes by taxi.
Mrs. Green is ________ grandmother.
The little girl _______ the dolls ________ that.
There is _____ “s” and _____ “u” in ______ word “use”.