1．Would you please make up a topic worth ________(discuss) in tomorrow's conference?
[答案] discussing
2．These rare animals are under the ________(protect) of the government.
[答案] protection
3．I hope you will always be ________(energy) when having classes.
[答案] energetic
4．A job－hunt with a clear target will surely help you achieve better results than an ________(aim) one.
[答案] aimless
