The factory produced a great number of computers, most of _______ shipped to foreign countries.
| A．them | B．which | C．it | D．what |
There is no doubt ________ those who work hard will succeed sooner or later.
| A．if | B．whether | C．why | D．that |
There are many websites，________you can find almost all the necessary information.
| A．where | B．from where | C．when | D．from when |
If we _______ adequate preparations, the conference wouldn’t have been so successful.
| A．haven’t made | B．wouldn’t make | C．didn’t make | D．hadn’t made |
I can hardly imagine Peter ________ across the Atlantic Ocean in five days.
| A．sail | B．to sail | C．sailing | D．to have sailed |
I can’t quite remember ________ I was taken to Beijing.
| A．that it was when | B．when it was that |
| C．when was it that | D．that was it when |