______ with the difficulty, he doesn’t know _____ to do [ ]

Florence Nightingale was well-known _____ a nurse in England _____ her kindness to the sick and wounded soldiers.

Can you come to my house on Wednesday afternoon ……________________

Who _____ be phoning us at this time of night — It might be your sister.

Our school is going to hold the ________ Culture Festival. —Yes! And we can take part in ________ activities.