Without proper lessons, you could a lot of bad habits when playing the piano.
| A．keep up |
| B．pick up |
| C．draw up |
| D．catch up |
________from what he said, he must be the thief who has stolen the car.
| A．Judging | B．Judged | C．To judge | D．Judge |
________from heart trouble for years, Professor White has to take some medicine with him wherever he goes.
| A．Suffered | B．To suffer | C．Having suffered | D．Being suffered |
________, the boy couldn’t enter his house.
| A．Since the key has lost | B．The key been lost |
| C．Lost the key | D．Having lost the key |
Time________, I can have done it better.
| A．permit | B．be permitted | C．permitting | D．to permit |
_______the exam, the boy was punished by his father.
| A．No passing | B．Having passed | C．Not passing | D．Not having passed |