My English-Chinese dictionary has disappeared. Who_____ have taken it ?
The new books ________ in the factory these days are mainly intended for children.
________ the English speech competition will be a lot of work, so I need some volunteers to help out.
If water becomes increasingly scarce in decades ________, water shortage will become a hot issue all over the world.
Misunderstandings ________ from lack of social communication, unless ________ properly, may lead to serious problems.
________ enough money, Li Hua was unable to buy the new house.