As a surgeon, I cannot any mistakes; it would be dangerous for the patient.
| A．appreciate | B．remove | C．offer | D．afford |
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 |