People are living in ___ world where mouse clicks rule our life, so online searches have become _____ must．
| A．the; / | B．/; a | C．a; a | D．a; the |
28. My English teacher has given me so much help that I really want to do something for him ______.
| A．in return | B．in fact | C．in surprise | D．in turn |
27. Look at the beautiful big house over there! It is said to _______ an old Japanese woman.
| A．belonging to | B．be belonged to | C．belong to | D．be belonging to |
26. The way _______ the scientist solved the problem was different from what the other scientists were used to.
| A．in which | B．what | C．from what | D．As |
25. —This is Janine speaking.
—Janine, I want to tell you Pat _______ for London. Have you decided to see him off?
| A．left | B．has left | C．is leaving | D．was leaving |
24. Only when the meeting began _______ that he had left his papers at his office.
| A．will he realize | B．he did realize | C．did he realize | D．should he realize |