When I attended a meeting in Beijing I ___ my old teacher’s house.
| A．called on | B．called at | C．visited at | D．visited on |
_________we sleep together or apart is one of the biggest cultural differences, and only in western societies ______ the feeling that babies should sleep apart from their parents.
| A．No matter; it is | B．Whether; is it | C．No matter; there is | D．Whether; is there |
Is _________ 48 hours _________ the man-made satellite _________ is made in our country to orbit the planet around?
| A．it; that; where | B．it; when; that |
| C．it for; that it takes; that | D．it; that it takes; which |
In no place other than Britain ____ experience four seasons in a single day.
| A．you can | B．people can | C．can one | D．can it |
_____ occurred to me that the murder happened ____ a rainy day.
| A．What; in | B．What; on | C．It; in | D．It; on |
It was ______ the old worker came that we______ the experiment.
| A．until；didn’t begin | B．not until; began |
| C．until; began | D．not until; didn’t begin |