The ship sailed _____ Xiamen _____ 30 miles an hour.

-- What caused the failure of the experiment?
-- _____.

  ______ the windows ______ the pictures of different styles.

  ________ several years he has been working like this.

   Standing on top of the mountain, we watched the sun ____ the horizon.

   –Excuse me, Madame. Is this plane _____take off soon?
---Oh, yes. In five minutes.

   – Look! What are those boys doing ______ the table?
---Well, they are playing cards.

  After he won all the money they treated him ______a king.

   They treated her very well _______one of the family members.

      ---What are you busy with ?
--- We are carrying out a research ____ the causes of cancer.