The students in the university are all taking courses _______ a degree.
| A．sticking to | B．leading to |
| C．turning to | D．referring to |
All of the flowers now raised here have developed from those _______ in the forest.
| A．once they grew | B．they grew once | C．they once grew | D．once grew |
Our company will move to a tall building _______ we worked two years ago.
| A．where | B．when | C．that | D．which |
Our company will move to a tall building _______ has just been complete.
| A．which | B．when | C．how | D．where |
Our company will move to a tall building _______ we bought last month.
| A．which | B．when | C．how | D．where |
She says that she’ll never forget the time ________ she works as a secretary in our company.
| A．which | B．when | C．how | D．where |