The students ____ busily when Miss Brown went to get a book she_____ in the office.
| A．had written, left | B．were writing, has left |
| C．were writing, had left | D．had written, had left |
______ really makes “Gangnam Style” popular is not the lyrics, but the part of “Horse Riding Dance”.
| A．What | B．That | C．Where | D．When |
Tony ________ for the company as an engineer for two decades. Now he teaches mechanics in Peking University.
| A．has worked | B．worked | C．is working | D．had worked |
Modern teaching equipment as well as some computers ________ to the village school last week.
| A．were sent | B．was sent | C．has been sent | D．had been sent |
It's on the festival occasions________ the family get together________ he misses his late father.
| A．where; that | B．which; when | C．when; that | D．that; when |
Shenzhou-VIII has docked with Tiangong-I successfully, ________ the start of the establishment of China’s own space station．
| A．marked | B．to mark | C．marking | D．having marked |