26．He never regretted the anxious hours he had had ______ for the missing papers．
| A．search | B．searching | C．searched | D．to search |
As we all know, it was _________ that resulted in the terrible car accident.
| A．because of her carelessness |
| B．because she was careless |
| C．her being careless |
| D．she was so careless |
Don’t answer the phone when the cell phone is being charged, for it ________ be very dangerous sometimes.
| A．shall | B．should |
| C．can | D．must |
Whatever happens ,Ben, ________ drugs.
| A．doesn’t take | B．not take |
| C．not taking | D．don’t take |
After _______ seemed like an hour, Michael started off on his bike for _______ his dream leads him.
| A．what; what | B．what; where |
| C．which; what | D．that; where |
Only under special circumstances ________to use the fire hose, otherwise they will be punished.
| A．are people permitted |
| B．people are permitted |
| C．people permit |
| D．do people permit |