--- Do you love teaching, Miss He?
--- I fell in love with teaching in 2000. I ________ for twelve years by this summer.
| A．will teach | B．would have taught | C．has been teaching | D．will have been teaching |
Have you realized the difficulty we have ____ the problem?
| A．worked out | B．to work out | C．work out | D．working out |
I think that ____ very difficult to learn.
| A．the politics is | B．politics is | C．politics are | D．the politics are |
---_______to you _______your great success!
---Thank you very much.
| A．Celebrate, for | B．Congratulate, on | C．Congratulation, on | D．Congratulations, on |
Distinguished guests and friends . _____the ceremony of the 50th Anniversary this morning are our alumni (校友) from home and abroad .
| A．Attend | B．To attend | C．Attending | D．Having attended |
It is very ___that the factory will have to close because the economic crisis .
| A．probably | B．likely | C．possibly | D．obviously |