-How amazing it is that astronauts are exploring outer space!
-It’s a challenge, I guess, _________man against nature.
| A．of | B．for | C．by | D．about |
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 |
Several leading _____ resigned from the party yesterday.
| A．figures | B．numbers | C．images | D．memberships |
The test not only helps make our _____ acquired knowledge permanent, but also enables us to find out what needs to take more time to improve.
| A．quickly | B．presently | C．shortly | D．newly |