I gave the boy a dictionary his selfless help to me.
| A．in return of |
| B．as a return |
| C．as a reward of |
| D．in reward for |
It was not until dark _______ he found _______ he thought was the correct way to solve the problem.
| A．that; what | B．that; that |
| C．when; what | D．when; that |
They lost their way in the forest, and _______ made matters worse was that night began to fall.
| A．that | B．it |
| C．what | D．which |
They are teachers and don’t realize _______ to start and run a company.
| A．what takes it | B．what they take |
| C．what takes them | D．what it takes |
The thought _______ he would open a Sichuan restaurant in Los Angeles surprised his wife.
| A．that | B．what |
| C．whether | D．when |
Air, or _______ is called the atmosphere, surrounds the whole world.
| A．what | B．which |
| C．that | D．it |