These problems are hard to . Will you give me some advice?
--What were you doing at 9 o’clock last Sunday morning?--I ________.
The accident ________ a windy night last year.
--How about your English?--I found ________ hard to learn it well.
He looks upset. He doesn’t know ________.
Mrs. Smith eats _______ meat, so he is ________ fat now.