23. Mr Jones, a professor, ___________ for his excellent lectures, is popular with his students.
| A．known | B．knowing | C．to be known | D．having known |
.Is this the very factory____he visited last month?
| A．which | B．that | C．where | D．in which |
The first thing____you should do is to learn all the new words by heart.
| A．what | B．that | C．which | D．who |
The students are talking about the strange people and stories ____ they met in the
adventure.
| A．that | B．which | C．what | D．whom |
It is not I but Mr.Green who____in charge of the company.
| A．is | B．am | C．are | D．was |
After living with his grandparents in the countryside fort en years, the boy returned to
The big city____his parents worked.
| A．which | B．where | C．that | D．when |