25. The book ______forty maps, ______three of Great Britain.
Students ________ remain in their seats until all the papers have been collected.
John Wood,an Internet blogger,discovered that Samsung ________ for not protecting its workers from a dangerous chemical used on its phones.
The sign says that children are admitted only if ________ by an adult.
Li Hua has been elected ________ monitor of our class to take ________ place of Ma Li.
—Would you like to help me with my work? —_______