_________ in the adult ceremony, the senior students feel they are shouldering heavier responsibilities now.
| A．Swear | B．Sworn |
| C．Having sworn | D．To have sworn |
It is only after my father was long gone _____ understand his deep love for me.
| A．I could | B．could I | C．that I could | D．when I could |
. A growing number of people are beginning to believe that learning new skills and knowledge
_____ more promotion opportunities.
| A．contributes to | B．refers to | C．devotes to | D．appeals to |
His interests extended _____ the fine arts to international politics and philosophy.
| A．across | B．through | C．over | D．beyond |
—Mr. Smith _____ in Russia for 10 years.
—No wonder he can speak Russian fluently and now teaches Russian in a Chinese college.
| A．had stayed | B．has stayed | C．stayed | D．stays |
He chose to teach in a western province, though he _______ in the city for a better life.
| A．could stay | B．would stay | C．could have stayed | D．had stayed |