—Why are you late today．Mary?
—I’m sorry，Mr Li．My bike ________ on the way．
| A．broke down | B．has broken down | C．breaks down | D．had broken down |
He is really nervous. He ______back and forth all the night waiting for the results.
| A．has been walking | B．had walked |
| C．walked | D．is walking |
Mary _______as a secretary in this company for twenty years and now she stays at home taking care of her own garden.
| A．has served | B．had served |
| C．is serving | D．served |
The company invested 80 percent of the money in training the staff, the rest of which ____saved for other purposes.
| A．is | B．are |
| C．was | D．were |
It was MaYun’s persistence and innovation ______contributes to the success in his career.
| A．which | B．what | C．who | D．that |
_______for the villagers that he gave away all his money and belongings.
| A．So the traveler was grateful |
| B．So grateful the traveler was |
| C．So grateful was the traveler |
| D．Grateful was the traveler so |