The companies are working together to create _________ they hope will be the best means of transport in the 21st century.
| A．which | B．that |
| C．what | D．who |
________ as the “first lady of speech”，Dr, Lillian Glass is recognized as one of the world's leading experts on communication skills.
| A．Knowing | B．Having known |
| C．Known | D．To be known |
—Why do you look sad?
—There are so many problems ________.
| A．remaining to settle | B．remained settling |
| C．remaining to be settled | D．remained to be settled |
A few days after the interview，I recevied a letter ________ me admission to the university.
| A．offering | B．offered |
| C．having offered | D．to be offered |
—We didn't find the Blacks ________ the lecture.
—No one had told him about ________ a lecture the following day.
| A．to attend；there to be | B．attending；there being |
| C．attended；there be | D．attend；there was |
Only ________ according to the directions can the medicine be quite effective.
| A．taking | B．taken |
| C．being taken | D．having been taken |