As the immune system weakens, it loses the ability ________ illnesses.
| A．fighting | B．fought |
| C．to fight | D．to be fought |
___ we have overlooked, however, is that there is no one answer to this question．
| A．Which | B．That | C．Where | D．What |
—What a shame!
—Yes, I ____ his not doing it, but in vain．
| A．was suggesting | B．will suggest |
| C．would suggest | D．had suggested |
Maybe you could be an inventor—maybe even good enough to _____ the next iPhone or the new medicine for cancer．
| A．put up with | B．keep up with | C．catch up with | D．come up with |
The child walked quietly to the bird．_____ into the forest before he was about to catch it．
| A．Flew it away | B．Away it flew | C．Flew away it | D．Away flew it |
—Could you introduce me a high quality car?
—My pleasure．_____ well even on wet roads, this kind of car is especially popular．
| A．Handled | B．To handle | C．Handling | D．Being handled |