The task _____ more difficult than we expect.
| A．proved to | B．proved us | C．was proved | D．proved |
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 |
—I really like the record you lent me.
—_______.
| A．My pleasure | B．I’m glad you like it |
| C．Thank you | D．Not at all |