We were told not to touch the equipment in the laboratory unless ________.
| A．allowed to do | B．allowing to do |
| C．allowed to | D．allowing to |
It's an either-or situation - we can Buy a new car this year or we can go on holiday But we can’t do.
| A．others | B．either | C．another | D．Both |
Four andhalf hours of discussion took us up to midnight,andBreak for cheese,chocolate and tea with sugar.
| A．a;a | B．the; the | C．不填；the | D．a;不填 |
Only By increasing the numBer of doctors By 50 percentproperly in this hospital.
| A． | can Be the patients | B． | can the patients Be treated |
| C． | the patients can Be treated | D． | treated can Be the patients |
A serious study of physics is impossiblesome knowledge of mathematics.
| A．against | B．before | C．beyond | D．without |
It was only after he had read the papersMr. Gross realized the task Before him was extremely difficult to complete.
| A．when | B．that | C．which | D．What |