The science of medicine, _______ progress has been very rapid lately, is perhaps the most important of all the sciences.
| A．to which | B．in which | C．Which | D．with which |
—Have you seen your friend off ?
—Yes. I watched the train leaving the station it disappeared from sight.
| A．unless | B．as if | C．so that | D．until |
We began to open to the outside world in the late 1970s.,there have been great changes in the country.
| A．As a result of | B．As a result | C．First of all | D．After all |
Hurry up! Flight 4406 off at 18:40.
| A．takes | B．took | C．will be taken | D．has taken |
Tom hasn’t come to work since last Friday. he have had an accident?
| A．Must | B．Could | C．Should | D．Might |
To know more about Japan’s recent claims about Diaoyu Islands, you can use the Internet or watch CCTV news, or .
| A．both | B．none | C．some | D．neither |