By the time my mother came back from work, my sister and I ________ supper and were waiting for her at the table.
A．have cooked B．were cooking C．had cooked D．would cook
As is reported, it is 100 years______Qinghua University was founded.
A．when B．before C．after D．since
He had his camera ready____ he saw something that would make a good picture.
A．even if B．if only C．in case D．so that
They were busy ________ an experiment when I came.
A．doing B．to be doing C．with doing D．to do
“Harry Potter” is said ______ into over twelve languages by the end of last year.
A．to be translated B．being translated
C．having been translated D．to have been translated
From his ____ look, I knew that the questions during the interview were ______.
A．puzzling; puzzled B．puzzled; puzzling
C．puzzling; puzzling D．puzzled; puzzled
