--How about your English?--I found ________ hard to learn it well.
Florence Nightingale was well-known _____ a nurse in England _____ her kindness to the sick and wounded soldiers.
I saw some _____ teachers _____ out of the office.
---There is nothing to worry about, _____? --- _____. I have prepared everything well.
Two _____ the students _____ to the opening ceremony.
---What did the policeman ask the neighbors about? --- He asked ____ between 3:00 and 4:00 yesterday afternoon.