The pipes have oil or water inside them, which is heated and sent to the storage tank until ______ to produce electricity.
| A．needed | B．needing |
| C．to need | D．having needed |
Sam has been appointed _______ manager of the engineering department to take ____ place of George.
| A．不填；不填 | B．the : 不填 | C．the; the | D．不填; the |
—Where is the shooting centre?
—It is about 50 kilometres ______ the city of Beijing.
| A．in south of | B．south of | C．the south of | D．southern of |
Though difficult, I ________ him find a job, which made him very pleased.
| A．tried to help | B．managed to help |
| C．tried helping | D．succeeded to help |
He was inspired to start again _________ he had failed.
| A．where | B．in which | C．when | D．what |
–She looks very happy. She ________have passed the exam.
--I guess so. It’s not difficult after all.
| A．should | B．must | C．could | D．might |