Last term our maths teacher set so difficult an examination problem _____ none of us worked out.
| A．that | B．as | C．so that | D．which |
______ and you will be admitted into your desired university.
| A．If making one more effort | B．If you make one more effort |
| C．One more effort | D．To make one more effort |
— Can I speak to _____ is in charge of the company?
— Hold on, please.
| A．whomever | B．who | C．whoever | D．whose |
It’s already 10 o’clock. I wonder how it ____that she was 3 hours late on such a short trip.
| A．came across | B．came out | C．came up | D．came about |
_______ never to come back again, the girl left the poor village without saying goodbye.
| A．Determined | B．Determining | C．Determine | D．To determine |
Measures have been taken to prevent the accidents, but much _____ for more improvement.
| A．remains to be done | B．is remained to do |
| C．remains to do | D．is remaining to be done |