18． My mother ____ for Beijing in a few days. I wonder when the earliest plane ____ on Monday?
| A．leaves; takes off | B．is leaving; takes off |
| C．is leaving; is taking off | D．leaves; is taking off |
268. The limited supply of water has been put into practice, take care to turn off the running ____ before you leave.
| A．radio | B．traffic lights | C．gas | D．Tap |
267. When he was very young, he made up his mind to be a doctor. Which of the following words can not be used instead of the underlined word?
| A．tailor | B．translator | C．Tibetan | D．Tourist |
266. Mr. Green's are at table now. The underlined part means ____.
| A．beside the table | B．having dinner | C．at the table | D．making a table |
265. Which of the following does not belong to the same category?
| A．suite__________ | B．flat | C．suit__________ | D．Apartment |
264. The invention of the coal-burning_______engine revolutionized industrial production in the 18th century and opened the way to the development of mechanized transport by rail and sea.
| A．vapour | B．steam | C．solar-energy__________ | D．atomic-energy |