Interest is as ________ to learning as the ability to understand, even more so.
| A．vital | B．original | C．adequate | D．explicit |
We saw ____ audience clapping their hands when ______ popular singer appeared on the stage．
| A．the; the | B．the; 不填 | C．an; a | D．不填; the |
After a long absence, I went back to college, ______ to pick up where I'd left off．
| A．hoping | B．hope | C．to hope | D．hoped |
No matter how ______，scientists are eager to know more about it by exploring.
| A．an ocean may be deep | B．deep may an ocean be |
| C．deep an ocean may be | D．may an ocean be deep |
The parking rules in public places should be ______ strictly， otherwise you will get a ticket.
A. realized B, recognized C. consulted D. observed
— Tony, are you listening to me?
—Sorry, Sir. I ______ to figure out what you said just now.
| A．was trying | B．have tried | C．tried | D．had tried |