The ability _______ an idea is as important as the idea itself.
| A．expressing | B．expressed | C．to express | D．to be expressed |
You can't imagine what great fun my brother and I had _________ up and down the tall, shaky steps.
| A．walk | B．to walk |
| C．walking | D．Walked |
—I find the environment is getting worse and worse. —Yes, that is _________ we humans go against nature.
| A．Because | B．why |
| C．that | D．How |
The famous painter _________ birds kept in cages in order to have the pleasure of setting them free.
| A．is said to be buying | B．is said to have bought |
| C．had said to buy | D．who said to have bought |
While intelligent people can often simplify the complex, a fool is more _________ to complicate the simple.
| A．possible | B．probable |
| C．likely | D．Certainly |
When I _________ the past and think how much time has been wasted, my heart bleeds.
| A．look back at | B．look forward to |
| C．look out of | D．look away from |