Tipping is neither encouraged nor common, although visitors may reward special services if they wish, _________ 10% of the bill is enough.
A which B where C in which D in which case
The police have reached some ________ conclusions about the possible cause of the accident.
The exact cause is still under investigation.
| A．authentic | B．precise | C．confidential | D．tentative |
Harry telephoned to the airport to_________ whether Flight 24 for San Francisco is departing on time.
| A．prove | B．ensure | C．confirm | D．identify |
The school, more than 90 percent of whose graduates are usually admitted into key universities, enjoys an excellent _______.
| A．occupation | B．reputation |
| C．contribution | D．foundation |
The athletes were all standing by the skating field, _________skating suits．
| A．all of them worn | B．all were wearing |
| C．all of whom wearing | D．all wearing |
Some people think it ________ privilege to study abroad, but it doesn't make _______ sense if you go when you even cannot look after yourself.
| A．a; / | B．a; the | C．the; / | D．the; a |