Gun control is a subject Americans have argued for a long time.
| A．of which |
| B．with which |
| C．about which |
| D．into which |
What I said and did at your house last night_________just between you and me.
| A．is | B．are | C．have been | D．had been |
He waited with his companion_________the rescuers came, and then helped them carry her back down the mountain.
| A．when | B．until | C．unless | D．while |
It's_________for an employee of this company to work seventy" hours a week since the competition is fierce in the industry.
| A．ordinary | B．usual | C．average | D．regular |
_____the 19th-century America, the novel Gone with the Wind tells the story of a woman facing war and starvation bravely.
| A．Set up | B．Set down | C．Set in | D．Set off |
You did me a huge favor. However, I lack words_________to express my thanks.
| A．through which | B．with which | C．where | D．for which |