It is possible that ______ 2030, cars and airplanes will run on the new fuel.
| A．by | B．on | C．until | D．at |
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 |
_____ Chinese basketball player Yao Ming will probably return to the NBA if he can recover from _____ earlier injury.
| A．不填; an | B．The; 不填 | C．A; an | D．The; the |