Because the shop ________，all the Tshirts are sold at half price.
| A．has closed down | B．closed down |
| C．is closing down | D．had closed down |
Though ________ in a big city, Bill always prefers to sing the songs of country life.
| A．bringing up | B．grown | C．raised | D．Keeping |
________ is known to us a11 is that the Diaoyu islands have been part of our Chinese territory since ancient times.
| A．As | B．Which | C．It | D．What |
Why hasn’t he come?________ on time, we would have to put off the trip.
| A．If he doesn’t come | B．If he will not come | C．If he didn’t come | D．If he wouldn’t come |
Kate _________ in America for many years, but she’d never regretted her decision to return to her motherland.
| A．worked | B．was working | C．has worked | D．had worked |
The old man, ________ abroad for twenty years, is on the way back to his motherland.
| A．to work | B．working | C．to have worked | D．having worked |