No matter how ______，scientists are eager to know more about it by exploring.
| A．an ocean may be deep | B．deep may an ocean be |
| C．deep an ocean may be | D．may an ocean be deep |
She was disappointed to find her suggestion _________.
| A．turning down | B．to be turned down | C．turned down | D．to turn down |
Mary doesn’t speak French, and does Joan.
| A．so | B．also | C．either | D．nor |
There were two roads ______ to the station.
| A．lead | B．led | C．leading | D．to lead |
The pilot asked all the passengers on board to remain ______ as the plane was making a landing.
| A．seat | B．seating | C．seated | D．to be seating |
The old man, ______ abroad for twenty years, is on the way back to his motherland.
| A．to work | B．worked | C．to have worked | D．having worked |