Gun control is a subject_____ Americans have argued for a long time.
| A．of which | B．with which | C．about which | D．into which |
Ladies and gentlemen, please remain_____ until the plane has come to a complete stop.
| A．seated | B．seating | C．to seat | D．seat |
As is often said, a friend is to man_____ water is to fish.
| A．what | B．as | C．that | D．which |
To his disappointment, the opinion he had held____ out wrong.
| A．turned | B． turning | C．has been turned | D．has turned |
—My son has got a straight A in all his final exams.
— What a ____ boy! Congratulations!
| A．promising | B．predictable | C．eager | D．curious |